Contrasting Characteristics of Lodging Resistance in Two Super-Rice Hybrids Differing in Harvest Index

Vulnerability of rice growing areas to strong typhoons coupled by the susceptibility of traditional rice varieties to lodging lead to low yield and poor quality of harvested rice. To address these problems, two experiments using factorial in Randomized Complete Block Design were conducted during the wet season to determine the effects of paclobutrazol and nitrogen on the lodging resistance, agro-morphological characteristics and yield performance of two traditional rice varieties Elon-elon and Palawan Red. Application of increasing concentration of paclobutrazol did not significantly affect the percentage filled spikelets per panicle, number of spikelets per panicle, weight of 1000 grains, dry matter yield, harvest index and grain yield. At all concentrations of paclobutrazol, Palawan red had the longest first and fourth internodes, more unfilled spikelets per panicle, heavier 1000 grains weight and higher leaf area index than Elonelon. On the other hand, smaller stem diameter, more productive tillers per hill and longer panicles were obtained from Elon-elon than Palawan red. Elon-elon applied with increasing rates of nitrogen in combination with 500 ppm paclobutrazol had bigger stem diameter, higher productive tillers per hill, higher number of filled spikelets per panicle, higher percentage filled spikelets per panicle, longer panicles, higher harvest index and higher grain yield than Palawan red. Apparently, Palawan red had longer first, second and third internodes, more unfilled spikelets per panicle, heavier 1000 grain weight and higher leaf area index than Elon-elon. Applications of 30 and 60 kg N per ha had significantly higher lodging index than the untreated plants. Harvest index and grain yield were lowest in plants applied with 30 and 60 kg N per ha, attributable to high lodging index. Paclobutrazol is effective in shortening the length of the lower internodes and inhibits stem elongation resulting to shorter plants with increased lodging resistance. This ultimately produced higher yield than those plants that lodged. Culm strength was reduced by high rates of nitrogen causing significant increase in lodging index. The time of lodging is crucial in predicting the yield performance of the plants. Early lodging resulted to huge reduction in yield while it has little or no effect on yield when it occurs at later stages of the rice crop.

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Canopy growth and biomass partitioning to yield in short-season lentil

Canadian Journal of Plant Science ◽

10.4141/p05-029 ◽

2006 ◽

Vol 86 (1) ◽

pp. 109-119 ◽

Cited By ~ 4

Author(s):

T. G. Hanlan ◽

R. A. Ball ◽

A. Vandenberg

Keyword(s):

Harvest Index ◽

Lens Culinaris ◽

Leaf Size ◽

Light Interception ◽

Canopy Openness ◽

Western Canada ◽

Lodging Resistance ◽

Branch Number ◽

Green Market ◽

Market Class

Lentil (Lens culinaris L.) cultivars in the large green market class in Western Canada have late-season bushy growth, low harvest index (HI), and lodge readily. The aim of this study was to compare a range of genotypes for canopy traits such as rapid growth, light interception, HI, lodging, and yield. Four stiff-stem unadapted genotypes varying in leaf size and canopy openness were compared with two large green market class and other locally adapted cultivars at three population densities in the field in 2001 and 2002. Canopy measurements included biomass and light interception at weekly intervals, lodging score, end of season HI and yield. Adapted cultivars had high biomass (525 to 700 g m-2), high seed yield (96 to 130 g m-2), high maximum light interception (61 to 80%), high final branch number (17 to 19), and greatest overall plant height (0.3 to 0.44 m), but large green cultivars were prone to lodging. Unadapted genotypes produced less biomass and lodged the least. Genotypes that accumulated most above-ground biomass yielded the highest, grew the tallest, branched the most, but lodged the most. Unadapted genotypes FLIP 2000-7L (tallest, highest yielding of the unadapted types) and FLIP 96-7L (most lodging resistant (2001) and most brittle stemmed (2002) were promising parents for improving lodging resistance, on the basis of lodging resistance and yield or stem stiffness, respectively. CDC Milestone had the best canopy characteristics of moderate biomass and high harvest index for Western Canada. Key words: Lentil, Lens culinaris, biomass, harvest index, yield, lodging

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Escontria chiotilla(Cactaceae): fruit development, maturation and harvest index

Fruits ◽

10.1051/fruits/2015013 ◽

2015 ◽

Vol 70 (4) ◽

pp. 201-212 ◽

Cited By ~ 1

Author(s):

Esther Aurora Ruiz Huerta ◽

Judith Márquez Guzmán ◽

Clara Pelayo Zaldívar ◽

Claudia Barbosa Martínez ◽

Leticia Ponce de León García

Keyword(s):

Fruit Development ◽

Harvest Index ◽

Escontria Chiotilla

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IMPROVEMENT OF SPRING DURUM WHEAT SELECTION METHODOLOGIES UNDER CLIMATE CHANGE CONDITIONS

Vestnik of the Russian agricultural science ◽

10.30850/vrsn/2019/3/33-36 ◽

1970 ◽

pp. 33-36

Author(s):

А. I. Grabovets ◽

V. P. Kadushkina ◽

S. А. Kovalenko

Keyword(s):

Grain Yield ◽

Durum Wheat ◽

Correlation Coefficient ◽

Harvest Index ◽

Unit Area ◽

Correlation Coefficients ◽

Chemical Mutagenesis ◽

Main Method ◽

The Relationship ◽

Selection Of

With the growing aridity of the climate on the Don, it became necessary to improve the methodology for conducting the breeding of spring durum wheat. The main method of obtaining the source material remains intraspecific step hybridization. Crossings were performed between genetically distant forms, differing in origin and required traits and properties. The use of chemical mutagenesis was a productive way to change the heredity of genotypes in terms of drought tolerance. When breeding for productivity, both in dry years of research and in favorable years, the most objective markers were identified — the size of the aerial mass, the mass of grain per plant, spike, and harvest index. The magnitude of the correlation coefficients between the yield per unit area and the elements of its structure is established. It was most closely associated with them in dry years, while in wet years it decreased. Power the correlation of the characteristics of the pair - the grain yield per square meter - the aboveground biomass averaged r = 0.73, and in dry years it was higher (0.91) than in favorable ones (0.61 - 0.70) , between the harvest and the harvest index - r = 0.81 (on average). In dry years, the correlation coefficient increased to 0.92. Research data confirms the greatest importance of the mass of grain from one ear and the plant in the formation of grain yield per unit area in both dry and wet years. In dry years, the correlation coefficient between yield and grain mass per plant was on average r = 0.80; in favorable years, r = 0.69. The relationship between yield and grain mass from the ear was greater — r = 0.84 and r = 0.82, respectively. Consequently, the breeding significance of the aboveground mass and the productivity of the ear, as a criterion for the selection of the crop, especially increases in the dry years. They were basic in the selection.

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