scholarly journals Effect of planting time and supplemental irradiation on growth and flowering of Lachenalia ‘Romaud’ 

2019 ◽  
Vol 46 (No. 2) ◽  
pp. 72-80
Author(s):  
Anna Kapczyńska
Keyword(s):  
Chlorophyll A ◽  
Dry Weight ◽  
Planting Date ◽  
Flowering Plants ◽  
Light Conditions ◽  
Specific Time ◽  
Natural Lighting ◽  
Affected Plant ◽  
Inflorescence Stems ◽  
Pot Plant

Growth and flowering of lachenalia ‘Romaud’ was studied with reference to its commercial potential as pot plant and the need to obtain flowering plants at a specific time. The experiment was carried out in a heated glasshouse. Lachenalia bulbs were planted in November, December, January and February. The plants were exposed to two lighting regimes, natural lighting and natural lighting with supplemental irradiation (HPS lamps). The later the planting date was, the faster the bulbs flowered, and they produced thicker inflorescence stems with greater number of florets. Depending on the bulb planting date and light conditions, the plants flowered from February to May. The leaves obtained from the bulbs planted in November and December were longer than those produced by the bulbs planted in January and February. Compared with control, supplemental irradiation accelerated flowering by 10–13  days and positively affected plant features by promoting the growth of thicker inflorescence stems with more abundant and longer florets. The leaves of irradiated bulbs were shorter (apart from the bulbs planted in February) and were characterised by a higher content of chlorophyll a, chlorophyll a + b and carotenoids as compared with control. Plants grown under HPS light also had the higher dry weight of bulbs, leaves and stems.

scholarly journals Effect of Asynchronous Light and Temperature Fluctuations on Plant Traits in Indoor Growth Facilities

Agronomy ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 755
Author(s):  
Camilo Chiang ◽  
Daniel Bånkestad ◽  
Günter Hoch
Keyword(s):  
Chlorophyll A ◽  
Field Trial ◽  
Plant Traits ◽  
Leaf Gas Exchange ◽  
Dry Weight ◽  
Plant Performance ◽  
Stress Effect ◽  
Light Conditions ◽  
Initial Field ◽  
Environmental Fluctuations

Several studies have recommended the incorporation of environmental fluctuations in indoor experiments if closer-to-natural results in plant experiments are desired. Previous authors have suggested that if these fluctuations are not applied in synchrony, a stress effect could be present since plants have evolved to cope with synchronic environmental fluctuations. This study aimed to identify the effect of disparity in fluctuations of two important environmental variables, light quantity and temperature, on the growth of seven plant species from different functional plant types. A full-factorial combination of light and temperature under fixed or variable conditions was applied in phytotrons, and plant performance under these conditions was compared with a previous field trial. In all phytotron treatments, the average light and temperature conditions were the same as in the initial field trial. Productivity, leaf gas exchange, chlorophyll fluorescence, pigmentation, and other leaf traits were recorded in all species at the end of the experiments. Most plant trait responses were highly dependent on species and treatment, but some general trends were observed. Light fluctuations were mainly responsible for increases in specific leaf area (SLA) and chlorophyll a concentration, as well as for reductions in total dry weight and chlorophyll a/b ratio, independent if in combination with fluctuation or fixed temperatures. When fixed light conditions were combined with variable temperatures, the plants showed on average lower Fv/Fm values, Amax, and CO2 yield, while under variable light conditions and fixed temperatures, Fv/Fm increased compared with fully fixed or variable conditions. Although significant differences of plant traits between the field trial and all phytotron treatments were present (likely due to differences in other parameters that were not controlled in the phytotrons), our results still suggest that a synchronous variation of environmental factors lead to a more natural-like plant growth than if these factors are fixed or vary asynchronously.

scholarly journals ‘Namakwa’ lachenalia’s response to flurprimidol and different planting dates

2016 ◽  
Vol 28 (2) ◽  
pp. 173-179 ◽  
Author(s):  
Anna Kapczyńska ◽  
Agnieszka Kidawska
Keyword(s):  
Growth Control ◽  
Planting Date ◽  
Stem Diameter ◽  
Stem Length ◽  
Cut Flower ◽  
Planting Dates ◽  
Planting Time ◽  
Inflorescence Stems ◽  
Beginning Of Flowering ◽  
Pot Plant

AbstractThe genusLachenaliahas great potential as a floriculture crop used as a pot plant or cut flower. Flurprimidol preplant bulb soaks (from 15 to 30 mg dm−3) and foliar sprays (from 15 to 60 mg dm−3) were applied for the growth control of ‘Namakwa’Lachenalia. Bulbs were planted in November, December, January and February and cultivated in a greenhouse. With a delaying of planting time, more compact plants with shorter and wider leaves and with floriferous inflorescence stems were obtained. Floret length, stem diameter and leaf number remained unaffected by planting date and flurprimidol treatment. The most evident impact of flurprimidol on shortening leaf and inflorescence stem length was noted after soaking the bulbs in 30 mg dm−3. The later the planting date, the shorter the time to the beginning of flowering. Soaking the bulbs in flurprimidol at 15 and 30 mg dm−3and spraying with flurprimidol at 60 mg dm−3resulted in a delay of flowering by 3-6 days.

scholarly journals Effect of Planting Date and Plant Spacing on the Rotenoid Production of Tephrosia vogelii in Puerto Rico

1969 ◽  
Vol 55 (1) ◽  
pp. 85-93
Author(s):  
R. H. Freyre ◽  
D. K. Barnes
Keyword(s):  
Puerto Rico ◽  
Plant Height ◽  
Management System ◽  
Dry Weight ◽  
Planting Date ◽  
Plant Spacing ◽  
Planting Dates ◽  
Plant Weight ◽  
Affected Plant ◽  
Tephrosia Vogelii

The effect of within-row plant spacing (approximately 19, 34 and 57 cm.) and time of planting (April 1, April 29, May 27) on rotenoid and seed production of Tephrosia vogelii in Puerto Rico is reported. Percent total rotenoids and seed yield per plant varied among lines, but were not significantly affected by plant spacing and time of planting. Planting date significantly affected time from planting to flowering and proportion of leaves to stem. The April 1 planting date increased number of days to flowering, thereby increasing leaf losses from diseases and senescence as compared to the April 29 and May 27 planting dates. Plant spacing significantly affected plant height, total plant dry weight per hectare and proportion of leaves to stem. Close plant-spacing tended to increase plant height and total dry plant weight, and to lower proportion of leaves. These results indicated that the most efficient crop management system of T. vogelii for Puerto Rico would include a May 27 planting date, with a plant population of about 53,000 plants per hectare. Experimental yields of approximately 280 kg. of total rotenoids or 550 kg. of seed per hectare were obtained from this management system.

Effect of planting date and density on calendula and peppermint herbs

2014 ◽  
Vol 1 (1) ◽  
pp. 25-29
Author(s):  
Rahim Mohammadian ◽  
Behnam Tahmasebpour ◽  
Peyvand Samimifar
Keyword(s):  
Mutual Effect ◽  
Dry Weight ◽  
Planting Date ◽  
Mass Reduction ◽  
Flower Number ◽  
Planting Dates ◽  
Randomized Design ◽  
Significant Difference ◽  
Completely Randomized Design ◽  
Total Maximum

A factorial experiment was conducted with a completely randomized design to evaluate the effects of planting date and density on calendula herbs and peppermint. It had 3 replicates and was done in Khosroshahr research farm, Tabriz in 2006. Under studied factors were: 3 planting dates (10 May, 25 May and 10 June) in 4 densities (25, 35, 45, 55) of the plant in square meters. The results of variance a nalysis showed that there was 1% probability significant difference between the effects of planting date and bush density on the leave number, bush height and the bush dry weight. But the mutual effect of the plant date in mentioned traits density was insignificant. Regarding the traits mean comparison, the total maximum dry weight was about the 55 bush density in mm. Also, the bush high density in mm causes the bush growth and its mass reduction. When there is the density grain, the flower number will increase due to bush grain in surface unit. Overall, we can conclude that 10 June planting and 45 bush density in mm is the most suitable items and results in favored production with high essence for these crops.

Mapping QTLs for yield components and chlorophyll a fluorescence parameters in wheat under three levels of water availability

2011 ◽  
Vol 9 (2) ◽  
pp. 291-295 ◽  
Author(s):  
Ilona Czyczyło-Mysza ◽  
Izabela Marcińska ◽  
Edyta Skrzypek ◽  
Małgorzata Chrupek ◽  
Stanisław Grzesiak ◽  
...  
Keyword(s):  
Drought Stress ◽  
Chlorophyll A ◽  
Chlorophyll A Fluorescence ◽  
Wheat Yield ◽  
Dry Weight ◽  
Interval Mapping ◽  
Main Stem ◽  
Severe Drought ◽  
Single Marker Analysis ◽  
Fluorescence Parameters

Drought is one of the major factors limiting wheat yield in many developing countries worldwide. Parameters of chlorophyll a fluorescence kinetics under drought stress conditions have been used to characterize dehydration tolerance in wheat. In the present study, a set of 94 doubled haploid lines obtained from Chinese Spring × SQ1 (CSDH), mapped with 450 markers, was evaluated for yield (grain dry weight/main stem ear), number of grains/main stem ear (NG) and chlorophyll a fluorescence parameters (FC) under moderate and severe drought stress, and compared with results for well-watered plants. quantitative trait loci (QTLs) were identified using Windows QTLCartographer version 2.5 software and the results were analysed using single-marker analysis (SMA) and composite interval mapping (CIM). Analysis using SMA and CIM showed mostly similar QTLs for all traits, though more QTLs were identified by SMA than by CIM. The genetic control of yield, NG and FC varied considerably between drought-stressed and non-stressed plants. Although no major QTL co-locations were found for yield and FC using CIM, the co-location of QTLs for NG, yield and Fv/Fm in drought-stressed plants was observed on chromosome 5A using SMA.

scholarly journals Effect of Planting Date and Gibberellic Acid on the Growth and Yield of Garlic

2010 ◽  
pp. 132-140 ◽  
Author(s):  
MA Islam ◽  
MH Reza ◽  
SMAHM Kamal ◽  
MA Wazed ◽  
KM Islam
Keyword(s):  
Gibberellic Acid ◽  
Plant Height ◽  
Dry Matter ◽  
Dry Weight ◽  
Planting Date ◽  
Growth And Yield ◽  
Planting Time ◽  
Local Cultivar ◽  
Number Of Leaves ◽  
Bulb Yield

An experiment was conducted with a local cultivar of garlic to study the effects of planting date and gibberellic acid on the growth and yield of garlic at the field laboratory of the Department of Crop Botany, Bangladesh Agricultural University, Mymensingh during November 2001 to April 2002. Early planting influenced the plant height, leaf number, bulb diameter and total dry matter. With the delay in planting time starting from November 7, the yield was chronologically reduced in later plantings. Significantly the highest bulb yield (2.67 t/ha) was recorded when planting was done on November 7 and lowest yield (0.92 t/ha) was obtained from December 22 planted crop. Bulb yield was higher in control plants than those of GA3 treated plants. The interaction effects of planting date and different concentrations of GA3 differed significantly in respect of plant height, number of leaves, bulb diameter and dry weight of roots, leaves and bulbs and yield of garlic.

scholarly journals Influence of boron on growth and mineral composition of bean (Phaseolus vulgaris L.)

1981 ◽  
Vol 38 (1) ◽  
pp. 309-318
Author(s):  
I. P. Oliveira ◽  
E. Malavolta
Keyword(s):  
Phaseolus Vulgaris ◽  
Mineral Composition ◽  
Nutrient Solution ◽  
Boron Concentration ◽  
Dry Weight ◽  
Phaseolus Vulgaris L ◽  
Mineral Concentration ◽  
Affected Plant ◽  
Differential Behaviour ◽  
Total Dry Weight

Nine cultivars of Phaseolus vulgaris L. were grown in nutrient solution to study the effect of boron on growth and mineral composition. Data obtained in thie study allowed for the following conclusions: (1) high levels of boron affected plant height, root length, dry weight of tops, dry weight of root, and total dry weight; (2) regression analysis was used to point out differential behaviour among cultivars in relation to boron concentration in nutrient solution; (3) the best mineral concentration in the plant tissue was obtained with application of 0,5 ppm of boron in the nutrient solution.

scholarly journals Morpho- biochemical evaluation of Brassica rapa sub-species for salt tolerance

Genetika ◽  
2016 ◽  
Vol 48 (1) ◽  
pp. 323-338 ◽  
Author(s):  
Sohail Jan ◽  
Zabta Shinwari ◽  
Malik Rabbani
Keyword(s):  
Salt Stress ◽  
Chlorophyll A ◽  
Brassica Rapa ◽  
Research Work ◽  
Poor Performance ◽  
Dry Weight ◽  
Salt Tolerant ◽  
Relative Water ◽  
Maximum Tolerance ◽  
Yellow Type

Salt stress is one of the key abiotic stresses that affect both the qualitative and quantitative characters of many Brassica rapa sub-species by disturbing its normal morphobiochemical processes. Therefore, the present research work was designed to study the effect of different NaCl events (0, 50,100 and 150 mmol) on morphological and biochemical characters and to screen salt tolerant genotypes among brown, yellow and toria types of B. rapa sub-species. The plants were grown in test tubes with addition of four level of NaCl (0, 50,100 and 150 mmol). The effect of salinity on shoot and root length, shoot/ root fresh and dry weight, relative water content (RWC), proline and chlorophyll a, b, a+b contents was recorded after 4 weeks of sowing. The genotype 22861 (brown type) showed excellent morphological and biochemical performance at all stress levels followed by Toria-Sathi and Toria-A respectively as compared to Check variety TS-1. The genotype 26158 (yellow type) gave very poor performance and retard growth. The %RWC values and chlorophyll a, b and a+b contents were decreased several folds with the increase of salt concentration. While, the proline contents was increased with raising of salt stress. The brown and toria types showed maximum tolerance to salt stress at early germination stages as compare to yellows one. The present study will serve as model to develop quick salt tolerant genotypes among different plant sub-species against salt stress.

scholarly journals THE ASSOCIATION OF FLOWERING HABIT WITH WINTER SURVIVAL IN RED AND ALSIKE CLOVER DURING THE SEEDLING YEAR OF GROWTH

1960 ◽  
Vol 40 (2) ◽  
pp. 335-344 ◽  
Author(s):  
Henri P. Therrien ◽  
Dale Smith
Keyword(s):  
Red Clover ◽  
Dry Weight ◽  
Flowering Plants ◽  
Winter Survival ◽  
Lower Percentage ◽  
Flower Buds ◽  
Root Branching ◽  
Crown Root

The percentage of plants that flowered in the seedling year in spaced populations of red and alsike clovers at Madison and Arlington, Wisconsin, was highest in the earliest seedings (May 15) and decreased with later seeding dates. No plants flowered in the July 15th seedings. The percentage of winterkilling during the first winter was higher in the flowering plants of each clover than in the non-flowering plants. Differences in flowering and winter survival were noted among clover strains and in winter survival among plant types within strains.Prevention of flowering in medium red clover by removing flower buds, flowering stems and/or elongating tillers resulted in greater vegetative vigour and winter survival. Plants that were allowed to flower freely in the seedling year in spaced populations had a smaller number of non-flowering crown tillers, a smaller width of crown, a lower dry weight of crown, root and total available carbohydrates in the roots, less root branching, a slightly lower percentage of total available carbohydrates in the roots, and more winterkilling during the first winter than plants that were prevented from flowering. These responses may help in part to explain the benefits attributed to clipping red clover in the seedling year.

Toxicity of reactive red 141 and basic red 14 to algae and waterfleas

2008 ◽  
Vol 58 (6) ◽  
pp. 1193-1198 ◽  
Author(s):  
S. Vinitnantharat ◽  
W. Chartthe ◽  
A. Pinisakul
Keyword(s):  
Humic Acid ◽  
Acid Solution ◽  
Chlorophyll A ◽  
Small Molecule ◽  
Textile Wastewater ◽  
Dry Weight ◽  
Bulk Solution ◽  
Low Concentration ◽  
Chlorella Sp ◽  
Cell Counts

Textile wastewater normally has a visible color although it has low concentration. This may affect the aquatic ecosystem. Two dyestuffs, Reactive Red 141 (RR141) and Basic Red14 (BR14) were used as compound models. RR 141 is an anionic dye which has a big molecule whereas BR 14 is a cationic dye and has a small molecule. The target organisms for toxicity test were green algae (Chlorella sp.) and waterfleas (Moina macrocopa). The effect of humic acid on the toxicity of dyestuffs to test organisms was also investigated. From the observation of cell counts, Chlorophyll a and dry weight of algae in the dye solutions for 4 days, it was found that all parameters increased as times increased. This revealed that algae could utilize dyestuffs as a carbon source. However, BR14 gave higher absorbance than RR141 at the wavelength of 430 nm which competed to the Chlorophyll a for algal photosynthesis. This resulted in the 96-h EC50 of BR14 and RR141 to Chlorella sp. were 10.88 and 95.55 mg/L, respectively. As for dye toxicity to waterfleas, the 48-h LC50 of BR14 and RR141 to waterfleas were 4.91 and 18.26 mg/L, respectively. The high toxicity of BR14 to waterfleas related to the small molecule of dye could pass into the cell and was absorbed by organelles of waterfleas. Toxicity of BR14 in humic acid solution to Chlorella sp. showed less toxic than RR141 in humic acid solution. This dues to the negative charge of humic acid could bound with a positive charge of BR14, resulted in low amount of BR14 remaining in the bulk solution. The toxicity of BR14 and RR141 in humic acid solution to waterfleas was increased as humic acid increased. Hence, the proper treatment of textile wastewater to yield low concentration of dyes in the effluent before discharging to the natural water is needed.

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