scholarly journals Responses of the Lodging Resistance of Summer Maize with Different Gene Types to Plant Density

Agronomy ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 10
Author(s):  
Jinsheng Yang ◽  
Wenjie Geng ◽  
Jiwang Zhang ◽  
Baizhao Ren ◽  
Lichun Wang
Keyword(s):  
Plant Height ◽  
Vascular Bundle ◽  
Bending Strength ◽  
Plant Density ◽  
Agronomic Traits ◽  
Dry Weight ◽  
Planting Density ◽  
High Yield ◽  
Vascular Bundles ◽  
Lodging Resistance

The appropriate increase of planting densities is the key to the obtainment of high-yield maize (Zea mays L.). However, lodging is a major constraint to limit grain yield under increased planting density in present maize production. Effects of population density on stalk lodging and agronomic traits were investigated using two maize cultivars Denghai 618 (DH618, low stalk with low spike height) and Xianyu335 (XY335, high stalk with high spike height). Four levels of density treatment were imposed by 1.5, 6.0, 7.5, and 9.0 × 104 plants ha−1. Results showed that bending strength, rind penetration strength, maximum bending strength, dry weight, and internode diameter of maize were significantly decreased with the increase of planting density. The change range of XY335 with the increase of planting density was significantly larger than that of DH618, showing a high sensitivity to planting density. In addition, the thickness of cortex and vascular bundle sclerenchyma cells was significantly reduced with the increase of planting density. Compared with 1.5 × 104 plants ha−1, the thickness of the above-ground third internode stem cortex was decreased by 9.64%, 12.72%, and 20.77% for DH618, and 19.26%, 30.49%, and 37.45% for XY335 at 6.0, 7.5, and 9.0 × 104 plants ha−1, respectively. The thickness of vascular bundle sclerenchyma cells at 1.5 × 104 plants ha−1 was decreased by 7.75%, 12.44%%, and 17.89% for DH618, 10.18%, 15.21%, and 24.73% for XY335, compared to those at 6.0, 7.5, and 9.0 × 104 plants ha−1, respectively. Visibly, with the increase of planting density, the thickness of cortex and vascular bundle sclerenchyma cells, and the number of vascular bundles were all significantly decreased, resulting in the increase of lodging rate. However, the extent of variation in these parameters for short-plant height hybrid was less than those for high-plant height hybrid, and the yield of short-plant height hybrid was greater than that of high-plant height hybrid, indicating that short-plant height hybrid has better resistance to lodging with higher yield at higher planting density. Therefore, lodging resistance and yield can be improved through selection and breeding strategies that achieving synergistic development of diameter, dry weight per unit, and cortex thickness in maize basal internodes.

scholarly journals Biomass yield and energy efficiency of willow depending on cultivar, harvesting frequency and planting density

2019 ◽  
Vol 65 (No. 8) ◽  
pp. 377-386 ◽  
Author(s):  
Bogdan Kulig ◽  
Edward Gacek ◽  
Roman Wojciechowski ◽  
Andrzej Oleksy ◽  
Marek Kołodziejczyk ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Dry Matter ◽  
Plant Density ◽  
Calorific Value ◽  
Dry Weight ◽  
Planting Density ◽  
High Yield ◽  
Full Production ◽  
One Year ◽  
The One

The study aimed at comparing the yield of dry biomass and energy efficiency of 22 willow cultivars depending on the harvesting frequency and variable plant density. The field experiment was established in 2010. The willow cultivars were planted in two densities; 13 300 and 32 500 plants per ha. Among the compared cultivars in the second year (2013) of full production, high yield of dry matter was obtained from cvs. Tordis (33.1 t/ha/year), Inger (30.4 t/ha/year) and Klara (29.0 t/ha/year). After six years of cultivation, the highest aboveground dry matter was given by cvs. Tora (27.4 t/ha/year) and Tordis (27.0 t/ha/year). The gross calorific value of willow biomass ranged from 15.2–20.1 GJ/t dry weight. Greater energy efficiency (329.3 GJ/ha/year) occurred in willow cultivars collected in a two-year cycle than in the one-year cycle (286.4 GJ/ha/year). In the two-year cycle collected in the third year after planting, energy efficiency was greater (379.5 GJ/ha/year) than in the two-year cycle harvested in the sixth year after planting (279.15 GJ/ha/year). The initial slower growth of biomass does not determine plant yielding.

scholarly journals Fine mapping of the BnUC2 locus related to leaf up-curling and plant semi-dwarfing in Brassica napus

2019 ◽  
Author(s):  
Chengwei Huang ◽  
Mao Yang ◽  
Danlei Shao ◽  
Yangming Wang ◽  
Shubei Wan ◽  
...  
Keyword(s):  
Candidate Gene ◽  
Plant Height ◽  
Ssr Markers ◽  
Fine Mapping ◽  
Agronomic Traits ◽  
Leaf Shape ◽  
Planting Density ◽  
Lodging Resistance ◽  
Leaf Trait ◽  
Curled Leaves

Abstract Background Studies of leaf shape development and plant stature have made important contributions to the fields of plant breeding and developmental biology. The optimization of leaf morphology and plant height to improve lodging resistance and photosynthetic efficiency, increase planting density and yield, and facilitate mechanized harvesting is a desirable goal in Brassica napus.Results Here, we investigated a B. napus germplasm resource exhibiting up-curled leaves and a semi-dwarf stature. In progeny populations derived from NJAU5737 and Zhongshuang 11 (ZS11), we found that the up-curled leaf trait was controlled by a dominant locus, BnUC2. We then fine mapped the BnUC2 locus onto an 83.19-kb interval on chromosome A05 using single nucleotide polymorphism (SNP) and simple sequence repeat (SSR) markers. We further determined that BnUC2 was a major plant height QTL that explained approximately 70% of the phenotypic variation in two BC5F3 family populations derived from NJAU5737 and ZS11. This result implies that BnUC2 was also responsible for the observed semi-dwarf stature. The fine mapping interval of BnUC2 contained five genes, two of which, BnaA05g16700D (BnaA05.IAA2) and BnaA05g16720D, were revealed by comparative sequencing to be mutated in NJAU5737. This result suggests that the candidate gene mutation (BnaA05g16700D) in the conserved Degron motif GWPPV (P63S) was responsible for the BnUC2 locus. In addition, investigation of agronomic traits in a separation population indicated that plant height, main inflorescence length, and branching height were significantly reduced by BnUC2, whereas yield was not significantly altered. Our findings may provide an effective foundation for plant type breeding in B. napus.Conclusions Using SNP and SSR markers, a dominant locus (BnUC2) related to up-curled leaves and semi-dwarf stature in B. napus has been fine mapped onto an 83.19-kb interval of chromosome A05 containing five genes. The BnaA05g16700D (BnaA05.IAA2) is inferred to be candidate gene responsible for the BnUC2 locus.

scholarly journals Combating Dual Challenges in Maize Under High Planting Density: Kernel Abortion and Stem Lodging

2021 ◽  
Vol 12 ◽  
Author(s):  
Adnan Noor Shah ◽  
Mohsin Tanveer ◽  
Asad Abbas ◽  
Mehmet Yildirim ◽  
Anis Ali Shah ◽  
...  
Keyword(s):  
Agricultural Land ◽  
Plant Density ◽  
Sugar Metabolism ◽  
Strong Relationship ◽  
Maize Yield ◽  
Planting Density ◽  
Lodging Resistance ◽  
Genetic Characteristics ◽  
Maize Productivity ◽  
High Plant Density

High plant density is considered a proficient approach to increase maize production in countries with limited agricultural land; however, this creates a high risk of stem lodging and kernel abortion by reducing the ratio of biomass to the development of the stem and ear. Stem lodging and kernel abortion are major constraints in maize yield production for high plant density cropping; therefore, it is very important to overcome stem lodging and kernel abortion in maize. In this review, we discuss various morphophysiological and genetic characteristics of maize that may reduce the risk of stem lodging and kernel abortion, with a focus on carbohydrate metabolism and partitioning in maize. These characteristics illustrate a strong relationship between stem lodging resistance and kernel abortion. Previous studies have focused on targeting lignin and cellulose accumulation to improve lodging resistance. Nonetheless, a critical analysis of the literature showed that considering sugar metabolism and examining its effects on lodging resistance and kernel abortion in maize may provide considerable results to improve maize productivity. A constructive summary of management approaches that could be used to efficiently control the effects of stem lodging and kernel abortion is also included. The preferred management choice is based on the genotype of maize; nevertheless, various genetic and physiological approaches can control stem lodging and kernel abortion. However, plant growth regulators and nutrient application can also help reduce the risk for stem lodging and kernel abortion in maize.

scholarly journals Identification of Bna.IAA7.C05 as allelic gene for dwarf mutant generated from tissue culture in oilseed rape

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Hongtao Cheng ◽  
Fenwei Jin ◽  
Qamar U. Zaman ◽  
Bingli Ding ◽  
Mengyu Hao ◽  
...  
Keyword(s):  
Tissue Culture ◽  
Plant Height ◽  
High Throughput Sequencing ◽  
Agronomic Traits ◽  
Crop Improvement ◽  
Dwarf Mutant ◽  
Sequencing Analysis ◽  
Rna Seq ◽  
Dwarf Phenotype ◽  
Lodging Resistance

Abstract Background Plant height is one of the most important agronomic traits in many crops due to its influence on lodging resistance and yield performance. Although progress has been made in the use of dwarfing genes in crop improvement, identification of new dwarf germplasm is still of significant interest for breeding varieties with increased yield. Results Here we describe a dominant, dwarf mutant G7 of Brassica napus with down-curved leaves derived from tissue culture. To explore the genetic variation responsible for the dwarf phenotype, the mutant was crossed to a conventional line to develop a segregating F2 population. Bulks were formed from plants with either dwarf or conventional plant height and subjected to high throughput sequencing analysis via mutation mapping (MutMap). The dwarf mutation was mapped to a 0.6 Mb interval of B. napus chromosome C05. Candidate gene analysis revealed that one SNP causing an amino acid change in the domain II of Bna.IAA7.C05 may contribute to the dwarf phenotype. This is consistent with the phenotype of a gain-of-function indole-3-acetic acid (iaa) mutant in Bna.IAA7.C05 reported recently. GO and KEGG analysis of RNA-seq data revealed the down-regulation of auxin related genes, including many other IAA and small up regulated response (SAUR) genes, in the dwarf mutant. Conclusion Our studies characterize a new allele of Bna.IAA7.C05 responsible for the dwarf mutant generated from tissue culture. This may provide a valuable genetic resource for breeding for lodging resistance and compact plant stature in B. napus.

scholarly journals Simulated mesotrione drift followed by glyphosate, imazethapyr, bentazon or glyphosate plus chlorimuron in soybean

2009 ◽  
Vol 89 (2) ◽  
pp. 265-272
Author(s):  
L. R. Brown ◽  
D. E. Robinson ◽  
K. Chandler ◽  
C. J. Swanton ◽  
R. E. Nurse ◽  
...  
Keyword(s):  
Glycine Max ◽  
Key Words ◽  
Plant Height ◽  
Seed Yield ◽  
Plant Density ◽  
Dry Weight ◽  
Shoot Dry Weight ◽  
Glycine Max L ◽  
Herbicide Drift

There have been anecdotal accounts of increased crop sensitivity due to herbicide drift followed by an in-crop herbicide. An experiment was conducted from 2005 to 2007 at Elora, Ridgetown, and Woodstock, Ontario, to determine the effects of simulated mesotrione drift followed by in-crop applications of glyphosate, imazethapyr, bentazon and glyphosate plus chlorimuron on glyphosate-resistant soybean [Glycine max (L.) Merr.] visual injury, plant height, plant density, shoot dry weight, and seed yield. As the rate of simulated mesotrione drift increased, there was an increase in soybean injury and a decrease in shoot dry weight, height, and yield. Simulated mesotrione drift followed by bentazon resulted in synergistic responses in injury shortly after application in some environments. This increase in injury was transient, with no synergistic responses in density, shoot dry weight, and yield. In contrast, antagonistic responses were observed when glyphosate, imazethapyr, or glyphosate plus chlorimuron were applied after simulated mesotrione drift in some environments. Further research is required to develop a better understanding of the interactions of drift followed by the application of an in-crop herbicide. Key words: Bentazon, chlorimuron, glyphosate, imazethapyr, mesotrione, synergism

scholarly journals Sources of characters useful for breeding in hulless barley

2020 ◽  
Vol 181 (3) ◽  
pp. 49-55
Author(s):  
N. V. Tetyannikov ◽  
N. A. Bome
Keyword(s):  
Plant Height ◽  
Agricultural Research ◽  
Plant Genetic Resources ◽  
Inverse Correlation ◽  
Grain Weight ◽  
Limiting Factors ◽  
High Yield ◽  
Forest Steppe ◽  
Lodging Resistance ◽  
Hulless Barley

Background. In the present-day situation, the problems pertaining to the nutritional quality of food and feed are quite pertinent for fodder production and cereal farming. The prospect to exploit hulless barley is regarded as a promising trend of agricultural research, because its grain contains chemical compounds of higher value than those in hulled barley. However, among the limiting factors of hulless barley cultivation, low yield should be mentioned, along with poor lodging resistance and susceptibility to fungal diseases. Therefore, the task of searching for and comprehensive studying of source material for hulless barley breeding is essential as the first step towards the development of high-yielding and adaptable cultivars.Materials and methods. Twenty hulless barley accessions, representing 15 botanical varieties, served as the target material for the study. Their genotypes were evaluated in the northern forest steppe environments of Tyumen Province (2015– 2017) according to the guidelines developed by the N.I. Vavilov All-Russian Institute of Plant Genetic Resources (VIR) and field trial methods by B. A. Dospekhov. Correlation analysis was used for statistical processing of experimental data.Results and conclusion. The degree of interactions between the studied characters was measured, and their effect size in the formation of the yield was shown for hulless barley accessions. An inverse correlation of medium strength (r = –0.37) was observed between plant height and lodging resistance, and a direct relationship between plant height and yield was recorded (r = 0.37). The yield was most closely associated with grain weight per plant (r = 0.61) and 1000 grain weight (r = 0.54). The research results showed that C.I.10975 (k-30624, Ethiopia), Liguleless (k-29894, Tajikistan), Schwarze Nackte Kraftborn (k-25788, Germany) and ‘De printempe’ (k-23491, France) had relatively high yield combined with a number of other useful traits. 

scholarly journals Effect and interaction of crop management factors and crop year on the yield of maize (Zea mays L.)

2020 ◽  
pp. 31-41
Author(s):  
Karamchand Bramdeo ◽  
Tamás Rátonyi
Keyword(s):  
Plant Density ◽  
Crop Management ◽  
Growing Season ◽  
Climatic Conditions ◽  
Planting Density ◽  
High Yield ◽  
Treatment Level ◽  
Adverse Weather ◽  
Significant Difference ◽  
Management Factors

The aim of this study was to determine the combination of treatment levels of crop management factors which can optimize and sustain maize yield under varying climatic conditions. The effect of winter wheat forecrop, three tillage systems (Mouldboard-MT, Strip-ST, Ripper-RT), two planting densities (60,000 & 80,000 plants ha-1), three fertilizer levels (N0-control, N80, N160 kg ha-1) with four replications in irrigated and non-irrigated treatments were evaluated over a five year period, 2015–2019. The obtained results revealed that growing season rainfall positively correlated with yield, whereas, temperature negatively correlated with yield. Impact of adverse weather on yield was less severe in biculture, irrigated plots, at lower planting density (60,000), lower fertilizer rate (N80) and in RT and ST, compared to MT. In years with favorable rainfall, yields of MT and RT were significantly (P<0.05) higher than ST. However, in a less favorable year, such as 2015, with 299 mm growing season rainfall and the lowest July rainfall (59% below mean) there was no significant difference (P>0.05) in yield among the three tillage treatments. Higher planting density (80,000), and fertilization rate (N160) in tandem with MT are treatments combination conducive for high yield under favorable climatic conditions, whereas, in years with low rainfall and high temperatures, RT and ST offer alternative to MT for optimum yield with 60,000 plants ha-1 and N80 treatment level. Crop year effect accounted for 20.7% of yield variance, fertilization 35.8%, forecrop 12.8%, plant density 3.4%, tillage 1.2% and irrigation <1%. It is conclusive that with proper selection of the appropriate levels of agrotechnological inputs the adverse effect of weather on yield can be mitigated.

scholarly journals EFFECTS OF PLANTING DENSITYAND ORGANIC FERTILIZATION DOSES ON PRODUCTIVE EFFICIENCY OF CACTUS PEAR

2016 ◽  
Vol 29 (4) ◽  
pp. 976-983 ◽  
Author(s):  
NALÍGIA GOMES DE MIRANDA E SILVA ◽  
MÉRCIA VIRGINIA FERREIRA DOS SANTOS ◽  
JOSÉ CARLOS BATISTA DUBEUX JÚNIOR ◽  
MÁRCIO VIEIRA DA CUNHA ◽  
MÁRIO DE ANDRADE LIRA ◽  
...  
Keyword(s):  
Arid Regions ◽  
Plant Density ◽  
Dry Weight ◽  
Productive Efficiency ◽  
Planting Density ◽  
Organic Fertilization ◽  
Cactus Pear ◽  
High Productivity ◽  
Experimental Station ◽  
Semi Arid

ABSTRACT Cactus is crucial for the livestock of semi-arid regions in Brazil. This plant has shown the high productivity of forage, which is influenced by several management factors. This study aimed to evaluate the effect of organic fertilization doses (20, 40 and 80 t/ ha of bovine manure/ha/two years) and planting densities (20, 40, 80 and 160 thousand plants/ha) on the productivity of cactus pear Clone IPA-20 (Opuntia ficus-indica Mill). At the Experimental Station of Caruaru at the Agronomic Institute of Pernambuco, IPA has conducted the experiment. The experimental design was randomized blocks, with split plot arrangements. Higher shoot productivity was observed with increased population density and the application of manure at 80 t ha-1 two years-1 with values of 61, 90, 117 and 139 t DM ha-1 two years-1 at densities of 20, 40, 80 and 160,000 plants ha-1. The planting density influenced the productivity of cladode-plant and root dry weight, showing exponential responses, with higher cladode-plant and roots weight by area observed with increased plant density. The efficiency of organic fertilization decreased with the increase in manure doses. For increase cactus productivity, 40 t of bovine manure ha-1 two years-1 for plantations with 160,000 plants/ha is recommended.

THE DEVELOPMENT OF PLANT-TO-PLANT VARIABILITY IN MAIZE AT DIFFERENT PLANTING DENSITIES

1979 ◽  
Vol 59 (3) ◽  
pp. 561-576 ◽  
Author(s):  
G. O. EDMEADES ◽  
T. B. DAYNARD
Keyword(s):  
Leaf Area ◽  
Plant Height ◽  
Plant Density ◽  
Sequential Sampling ◽  
Dry Weight ◽  
Frequency Distributions ◽  
Time Interaction ◽  
Coefficients Of Variation ◽  
Grain Formation ◽  
Shoot Weight

The development of plant-to-plant variability in dry weight components, leaf area, plant height and ear characteristics was studied by sequential sampling in a single-cross maize (Zea mays L.) hybrid grown in the field at 50 000, 100 000, 150 000, and 200 000 plants/ha. Coefficients of variation (CV) for dry weight generally increased with plant density, and were greatest for ear components. The greatest density × time interaction for the CV of dry weights of most organs occurred 1–3 wk prior to silk emergence. The CVs of plant height and leaf area per plant were little affected by density. Total shoot weight, plant height, leaf area, and floret primordia per ear row were generally normally distributed for all densities throughout the season. This contrasted, at high densities, with bimodal frequency distributions of maximum silk length and upper ear weight at flowering, and of grain yield and kernel number per plant at maturity. Frequency distributions of silk length and other flowering data indicated that florets of barren plants ceased development prior to or immediately after flowering. Bimodal frequency distributions of grain number and grain weight per plant suggested the existence of some minimum assimilation rate per plant which must be exceeded before normal grain formation occurs.

Cultivar, sowing date and plant density studies of fibre hemp (Cannabis sativa L.) in Tasmania

2000 ◽  
Vol 40 (7) ◽  
pp. 975 ◽  
Author(s):  
S. N. Lisson ◽  
N. J. Mendham
Keyword(s):  
Plant Density ◽  
Cannabis Sativa ◽  
Initial Density ◽  
Dry Weight ◽  
Sowing Date ◽  
Planting Density ◽  
North West ◽  
Linum Usitatissimum L ◽  
Short Period ◽  
Final Harvest

This paper reports on a 3-year agronomic study into fibre hemp (Cannabis sativa L.) conducted in Tasmania, Australia. The performance of selected hemp cultivars, and the responses to sowing date and plant density were investigated as part of a broad feasibility study to assess the potential of fibre hemp and flax (Linum usitatissimum L.) as sources of fibre for the Australian newsprint industry. Trials were conducted at separate sites in north-west and south-east Tasmania. Nine cultivars from the Ukraine, Hungary and France were examined in 2 separate trials. The Hungarian cultivars, Kompolti and Unico B, and the French cultivar Futura 77 had the highest single plot dry stem yields (up to 1500 g/m 2 ) and bark proportions (up to 40%). All the cultivars flowered toward the end of January, suggesting that the growing season in Tasmania could accommodate much later flowering and potentially higher yielding genotypes. Levels of the psychoactive agent, delta-9-tetrahydrocannabinol were consistently below the legal maximum of 0.35% (dry weight basis). Three sowing date trials were conducted across 2 seasons incorporating dates between mid September and mid November and a single autumn planting at the end of May. Interactions with cultivar and planting density were also considered. Stem and bark yield declined with delays in sowing after early–mid October in response to a decline in calendar days and thermal time from sowing to flowering. The response was most pronounced in sowings of Kompolti, which flowered within a short period and differed more substantially in durations to flowering. Earlier sowings were limited by premature flowering in response to shorter daylengths and by poor drainage at one of the 2 trial sites. The success of early sowings in Tasmania would appear to depend on finding cultivars less sensitive tophotoperiod, and cultivation on well drained sites. A further trial was conducted to investigate the influence of plant density on hemp yields. Treatments included densities from 50 to 300 plants/m 2 . Plant density declined with crop growth across all treatments and was most pronounced for populations of 200 and 300 plants/m 2 . Final harvest stem yield responded in a parabolic manner to plant density, with maximum yields at about 110 plants/m 2 . Differences in the percentage of the long, high quality bark fibre at final harvest were generally small and not significant. However, regression analysis of the response of bark percentage suggested a linear decline with increasing initial density.

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