Analysis of grain filling in two-rowed barley [Hordeum vulgare] based on sink-source relation
1999
Arakawa, A. (Kyoto Univ. (Japan). Coll. of Agriculture) | Nakagawa, H. | Horie, T.
The objective of this study was to investigate quantitative relationship between the grain filling of two-rowed barley (Holdeum vulgare L.) and availability of carbohydrates during the grain filling stage. The plants of barley (cv. Amaginijo) were shaded at various stages during grain filling, or deprived of leaf blades or spikelets at anthesis. There was a close relationship between average grain weight and filling percentage, suggesting that the filling percentage can be estimated from the average grain weight. The maximum average grain weight was 42.9 mg, and average grain weight was roughly estimated from the available carbohydrate (sum of the amount of stored carbohydrates before anthesis and assimilates during the grain filling stage) per grain ((Delta-W + NSC0)/n). However, the grain filling of the plants shaded intensively during the early grain filling stage was inferior to that of the plants deprived of leaf blades or those shaded during the middle grain filling stage, although they had nearly the same amount of (Delta-W + NSC0)/n. This suggests that spikelets shaded intensively during the early grain filling stage have a lower carbohydrate accumulating capacity. An analysis of the above results, suggested that the carbohydrate accumulating capacity of barley spikelet is determined around 15 days after anthesis, and that the final grain weight can be estimated from (Delta-W + NSC0)/n and the grain weight at 15 days after anthesis. It was also suggested that there is an optimum spikelet number to maximize the filled grain yield of Amaginijo depending on the amount of Delta-W + NSC0
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