Growth Regulators and Assimilate Partition
As has already been pointed out (Wareing, see Chapter 8), crop yield depends not only upon the total dry matter production (biomass) by the crop, but also upon the proportion of the total dry matter which constitutes the harvested part of the crop, the so-called “harvest-index.” It is generally accepted that the increased yield of crop plants over that of their wild ancestors is primarily due to the improved distribution of dry matter to the harvested part of the plant, rather than to increased production of total dry matter. Hence a better understanding of the processes controlling the partition of assimilates within the plant is of paramount importance for the further improvement of crop yields.
KeywordsGrowth Substance Competitive Ability Sieve Tube Sink Tissue Phloem Transport
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