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• W2186043740 abstract "l~lH~~~~il~~~~~l Abstract Several studies conducted under high input conditions have indicated little susceptibility of pearl millet to water deficit until1 early grain filling, because the Introduction losses in main shoot production were fully compens- ated by increased tiller fertility. The present study assessed the impact of water deficits at three develop- ment stages: prior to flowering (S30), at the beginning of flowering (545), and at the end of flowering (S60) in pearl millet grown in experimental conditions similar to Sahelian farming conditions. It included a control irrigation treatment simulating the natural distribution of rainfall throughout the cropping season. Both bio- mass production and grain yield were severely reduced by S30 and S45, while S60 had no effect. In S30 and S45, the flowering of tillers was delayed or totally inhibited. In both of these treatments, the low number of productive tillers did not compensate for damage The usual effects of drought on the development of a plant are a lowered production of biomass and/or a change in the distribution of this biomass among the different organs. The drought resistance of a cultivated plant reflects its capacity to limit the impact on the economic yield of these changes in biomass production and distribution. This capacity will depend on the devel- opment phase affected by water deficit, as well as on the intensity and the length of the drought. In Sahelian climates, where agrosystems are based essentially on pearl millet (Petznisetum gluucum (L.) R. Br.), the risks of drought can be classed into two types according to their impact on pearl millet cultivation. l i to panicle initiation and flowering of the main shoot. (1) Droughts at the beginning or end of the cropping All treatments maintained green leaves on the main season, frequent and often long, but to which peasant shoot during the grain filling period, and in S30 leaf farmers respond by successive re-sowing (in the case growth recovered from mid-season drought. These of early droughts) or by the choice of short-season results illustrate how pearl millet mostly escapes cultivars tolerant of post-floral water deficits (in the drought by matching its phenology to the mean rainfall case of late droughts); distribution in the Sahel. In the case of mid-season (2) Intermediate droughts, less frequent and often brief drought, some late productive tillers and the mainten- (about 10 d), but very unpredictable and without any ance of green leaf biomass of the main shoots limited, practical remedies. They affect development stages but did not overcome, the yield losses. This study such as initiation of panicles, earing, or flowering stresses the importance of agro-ecological conditions which, in cereals, are generally sensitive to water in control treatments, particularly the water regime deficits. The variability of these droughts in time and and crop density, when assessing crop drought space complicates the characterization of drought- __ .-- - resistant varieties. I l resistance." @default.
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• W2186043740 date "1997-01-01" @default.
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• W2186043740 title "and yield of pearl millet (Pennisetum glaucum (L.) R. Br.) grown in Sahelian conditions" @default.
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