ISSN:
1573-5060
Keywords:
Triticum aestivum
;
wheat
;
physiology
;
grain yield
;
inheritance
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary Post anthesis physiological characters were examined in four genotypes and a diallel set of their progenies. Variation in total carbon uptake by photosynthetic tissue above the flag leaf node was primarily related to leaf area and ear size differences during the early grain filling period. Flag leaf apparent photosynthetic rates during the late grain filling period were closely correlated with flag leaf chorophyl levels. During the period of rapid growth, genotypes differed in the proportion and total quantity of current assimilate translocated to the grain. Total rather than proportional translocation was correlated with grain number and grain yield. Differences in total grain protein were primarily related to total plant nitrogen at anthesis and secondarily to the proportion of this nitrogen translocated to the grain. The level of post anthesis nitrate reductase activity decreased with increasing flag leaf age, but genotypic differences were not closely related to differences in total grain protein contents. Significant general combining ability effects were found for flag leaf chlorophyll levels, flag leaf photosynthetic rates at higher illuminances during the late grain filling period, total plant carbon uptake, total ear carbon uptake, and proportional carbon translocation to the grain. A preponderance of significant general combining ability variances suggests that additive gene action is of particular importance in the inheritance of these physiological characters.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00036885
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