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Protocols in ecological and environmental plant physiology

 

 Just Accepted

This article has been peer reviewed and accepted for publication. It is in production and has not been edited, so may differ from the final published form.


Grain yield and physiological traits of rice drought-yield QTL qDTY12.1 lines showed different responses to drought and soil characteristics in upland environments

Amelia Henry, Shalabh Dixit, Nimai Mandal, S Anantha, Rolando Torres, Arvind Kumar

Abstract

To improve yield in upland conditions, near-isogenic lines (NILs) of major-effect rice drought-yield QTL qDTY12.1 were developed in the background of upland variety Vandana. These NILs previously showed greater water uptake, a larger proportion of lateral roots, and higher transpiration efficiency under drought than Vandana, and one NIL (481-B) was selected as having the highest yield. In this study, the NILs were assessed in 2 greenhouse and 18 upland field trials for their response to drought and different soil textures. Performance of qDTY12.1 NILs was not affected by soil texture but showed a notable response to drought stress severity. The yield advantage of 481-B over Vandana was highest in field trials with intermittent drought stress, in which mean trial yield was greater than 0.5 t ha-1, and in the least favorable well-watered trial. The effects of qDTY12.1 on water uptake were most apparent under mild to moderate stress, but not in very severe drought or well-watered treatments, whereas the lateral root and transpiration efficiency responses were observed under a range of conditions. These results highlight the varying response of qDTY12.1 across upland environments, and the complexity of multiple mechanisms acting together to confer an effect on rice yield under drought.

FP13324  Accepted 14 April 2014
 
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