GENETIC VARIABILITY IN F5 AND F6 GENERATIONS OF BREAD WHEAT (Triticum Aestivum L.) UNDER TIMELY AND LATE SOWN CONDITIONS

Abstract

The present study was conducted to assess the genetic variability in 238 F5 and F6 progenies derived from WH 711 / WH 542 cross for nineteen yield, its components and physiological traits. Analysis of variance showed significant differences among the genotypes for all the traits. The phenotypic coefficient of variation was found higher than their respective genotypic coefficient of variation for all the traits in both the generations indicating the least influence of the environment. Moderate to High PCV and GCV were observed for chlorophyll-b, chlorophyll-a, carotenoids, number of grains per spike, grain weight per spike, grain yield per meter, biological yield per meter, harvest index. High heritability was recorded for days to heading, chlorophyll-a, chlorophyll-b, carotenoids, number of grains per spike, grain weight per spike in both the generations. Similarly moderate to high genetic advance was observed for chlorophyll-b, seed density, grain weight per spike. Therefore these traits must be given importance during the selection for genetic improvement.

Impact of Zinc and Thiourea Application on Growth and Yield of Summer Green Gram (Vigna radiata L.)

“…This favourable changes in the crop may be attributed to improved growth and development of the crop with thiourea treatment action potentially targeting the meristematic activity of apical tissues with stimulatory effects on cell division which promotes growth in shoot length and cell number for improved leaf area (mainly by higher sulphur and nitrogen nutrition). Thiourea boosted net photosynthetic rates as well as total chlorophyll and starch concentrations in the leaves, resulting in maximum plant height and branches [12]. Singh and Singh also reported that application of thiourea @ 500 ppm at pre-flowering and pod initiation stages significantly increased plant height and branches than the control treatments [13].…”