Role of Auxin Levels at different Grain Type and Position within a Spike of Wheat

Zanjan, Maziar Ghandian; Asli, Davood Eradatmand
October 2012
Advances in Environmental Biology;Oct2012, Vol. 6 Issue 11, p2922
Academic Journal
Grain growth rate (GGR) and indoly1-3 acetic acid (IAA) Levels were experimented at different grain types and position within developing grains of wheat (Tricumaestivum L. var. PBW-343). Main spikes were divided into three grain positions included proximal, middle, and distal regions, and further into two grain types included basal and epical grains. Grain dry weight, and IAA levels were determined in ten labeled spikes which sampled five times, seven-day intervals started from seventh day after anthesis (DAA) up to 28th DAA, and at maturity. IAA contents increased until 14th DAA. The maximum level of grain growth rate (GGR) was observed at 14th 21st DAA. Furthermore, the differences in IAA contents, among spikelets indifferent regions of the spike, and also among grains within a spikelet were positively correlated with the differences in dry matter accumulation. The results suggest that IAA levels play an important role in regulating grain filling pattern. Furthermore, it could be possible to increase grain weight potential by improving IAA levels in grain, especially during the early filling stage either through breeding or crop management.


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