Graduate Thesis Or Dissertation
 

Identification and inheritance of factors influencing the rate and duration of grain fill in selected wheat populations, (Triticum aestivum L. em Thell)

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/j9602346c

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  • To study the grain filling traits in wheat, two winter cultivars and four spring cultivars were selected. The resulting Fl, F2, F3 and backcrosses were tested. The following measurements were made: a) Visual traits for physiological maturity (PM), b) Grain dry weight accumulation, c) Regression models for grain filling period, d) Chlorophyll content and spectra analyses in flag leaves, e) Sucrose content in top node of stems. Of the six visual traits noted, the complete loss of green color from glumes was the best indicator of physiological maturity (PM), however it did vary among the different genotypes tested. Measurements of chlorophyll content and shift in the second derivative spectra of chlorophyll offered a more accurate estimate of PM than any visual traits in a growth chamber. A shift in the second derivative spectra was earlier than PM under field conditions. There was a good agreement between the date when the sucrose content in the top node of wheat stem fell to the minimum level and PM; this date seems to be a good indicator of PM. The shift of band Ca 693 in the fourth derivative spectra during grain filling had different patterns in the hybrid suggesting that the shift be controlled by cytoplasmic factor(s). The linear model monitoring the linear phase of grain filling is better than the polynomial models monitoring the whole period of grain filling for estimating the rate and duration of grain filling. Additive and non-additive gene actions were both significant in inheritance of the grain filling rate, effective duration and grain weight. Additive gene action was more important for the grain weight and less important for the effective duration of grain filling than non-additive gene action. Narrow sense heritability estimates were low for the grain filling rate and duration and high for grain weight. Grain filling rate was positively correlated with grain weight and grain yield and negatively associated with the duration of grain filling. The effective duration of grain filling also had a positive direct effect on grain yield, however this relationship was obscured by strong negative relation between the rate and effective duration of gain filling.
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file details ChuheChen1988.pdf 2017-08-09 Público Descargar