Small temporal differences in water uptake among varieties of pearl millet Pennisetum glaucum L. R. Br. are critical for grain yield under terminal droughtReportar como inadecuado




Small temporal differences in water uptake among varieties of pearl millet Pennisetum glaucum L. R. Br. are critical for grain yield under terminal drought - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Plant and Soil

, Volume 371, Issue 1–2, pp 447–462

First Online: 10 April 2013Received: 28 May 2012Accepted: 24 March 2013

Abstract

Background and aimIntuitively, access to water from the soil at key phenological stages is important for adaptation to drought. This study aimed to assess the temporal pattern of water extraction under terminal drought stress.

MethodsPearl millet genotypes with varying levels of terminal drought tolerance were grown in a lysimetric system with a soil volume and plant spacing similar to field conditions. Water extraction was monitored until maturity under differing water regimes.

ResultsThe yield did not differ among genotypes under well-watered WW conditions, and the water extraction profile of WW plants was similar across all genotypes. In contrast, the yield of sensitive genotypes was 30–100 % lower than that of tolerant lines under water stress WS. The total volumes of water extracted by tolerant and sensitive genotypes were similar under WS; however, tolerant genotypes extracted less water prior to anthesis, and more water after anthesis. Grain yield was positively related to the amount of water extracted during week three after panicle emergence. Increased water extraction after anthesis benefitted the tillers more than the main culm and was correlated with higher staygreen scores.

ConclusionIncreased water uptake after anthesis, which results from earlier water conservation during pre-anthesis, increases yield under terminal drought in pearl millet.

KeywordsRoots Water extraction Lysimeter Drought QTL Water conservation Responsible Editor: Martin Weih.

Electronic supplementary materialThe online version of this article doi:10.1007-s11104-013-1706-0 contains supplementary material, which is available to authorized users.

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Autor: Vincent Vadez - Jana Kholová - Rattan S. Yadav - Charles Tom Hash

Fuente: https://link.springer.com/







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