The stay green trait as an indication of drought tolerance in grain sorghum [electronic resource].

Includes references.

Drought stress is a major constraint to sorghum production worldwide. The stage of growth at which moisture stress occurs is important in determining the response of sorghum to soil moisture stress. The post flowering stress occurs when plants are under severe moisture stress during the grain filling stage. The term stay green is used to describe post flowering drought resistance. Plant symptoms indicating either a desirable or undesirable response to stress at this stage bave been described and can be visually rated in the field. The distinct visual responses are reliable indicators of a genotype's response to drought and are predictable and repeatable across locations and years under similar stress conditions. Three hybrid tests for post flowering drought resistance i.e. the preliminary drought hybrid test the stay green hybrid test; and the drought hybrid test; were evaluated and screened in limited irrigation fields and a dry land farming conditions at Texas Experimental Station. Lubbock. Texas. Data were collected on days to 50% flowering and leaf plant death (LPD) rating as an indication to stay green character. The days to 50% flowering for the dry land farm flowered earlier than the other two test locations. Several female lines i.e. ATX 3197; A35. ATX 623 and A4R showed the lowest LPD ratings in their hybrids and could be used in the breeding program.

Summary in Arabic.

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