Grain filling of cereals under soil drying.

Book Title: NA
Year Published: 2006
Month Published: NA
Author: Yang, JianChang ; Zhang, JianHua
Book Group Author: NA

Monocarpic plants require the initiation of whole-plant senescence to remobilize and transfer assimilates pre-stored in vegetative tissues to grains. Delayed whole-plant senescence caused by either heavy use of nitrogen fertilizer or adoption of lodging-resistant cultivars/hybrids that remain green when the grains are due to ripen results in a low harvest index with much nonstructural carbohydrate (NSC) left in the straw. Usually, water stress during the grain-filling period induces early senescence, reduces photosynthesis, and shortens the grain-filling period; however, it increases the remobilization of NSC from the vegetative tissues to the grain. If mild soil drying is properly controlled during the later grain-filling period in rice (Oryza sativa) and wheat (Triticum aestivum), it can enhance whole-plant senescence, lead to faster and better remobilization of carbon from vegetative tissues to grains, and accelerate the grain-filling rate. In cases where plant senescence is unfavorably delayed, such as by heavy use of nitrogen and the introduction of hybrids with strong heterosis, the gain from the enhanced remobilization and accelerated grain-filling rate can outweigh the loss of reduced photosynthesis and the shortened grain-filling period, leading to an increased grain yield, better harvest index and higher water-use efficiency.

Pages: 223 - 236
Volume: 169
Number: 2
Journal: New Phytologist
Journal ISO: NA
Organization: NA
Publisher: NA
ISSN: 0028-646X

crop yield, drought, filling period, harvest index,heterosis, nitrogen fertilizers, photosynthesis, plant water relations,reviews, rice, senescence, water stress, water use efficiency, wheat,Oryza, Oryza sativa, Triticum, Triticum aestivum, Oryza, Poaceae,Cyperales, monocotyledons, angiosperms, Spermatophyta, plants, Triticum,Field Crops (FF005) (New March 2000), Plant Water Relations (FF062),Fertilizers and other Amendments (JJ700)

Source: EBSCO
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