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Rice spikelet sterility caused by chilling during microspore stage of panicle development is a major cause of the rareness of the indica sub-species in cool environments. A diversity panel of 200 indica accessions including traditional and improved accessions forming 4 genetic sub-groups (I1 to I4), along with 22 accessions representing other genetic groups of Oryza sativa L., was field phenotyped...
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