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GrainGenes Reference Report: WIS-98-5

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Reference	WIS-98-5
Title	Low temperature germinability and ABA sensitivity in wheat cultivars with pre-harvest sprouting tolerance
Journal	Wheat Information Service
Year	2004
Volume	98
Pages	5-10
Author	Ichinose Y Kuwabara T Iriki N Takata K
Abstract	To prevent pre-harvest sprouting (PHS) in wheat, selection of genotypes that maintain dormancy and imbibe even at low temperature during grain development is receiving considerable attention in breeding programmes. However, little information is available for the genetic variation in low temperature germinability and its relation to the abscissic acid (ABA) sensitivity of an embryo. Grains of 30 cultivars with various levels of PHS tolerance were incubated in water or in ABA solution at 2 different temperatures (12 and 20 deg C) and evaluated for low temperature germinability and ABA sensitivity. When the grains at the dough-ripe stage were germinated at 12 deg C, grain germinability and ABA sensitivity varied even in PHS-tolerant cultivars. The dormancy of some PHS-tolerant cultivars broke with the loss of ABA sensitivity at low temperature, suggesting that tolerance to PHS is in part genetically independent of low temperature germinability. A close relationship was found between low temperature germinability and ABA sensitivity. For wheat production under cool moist conditions at maturity, it would be significant to develop cultivars that do not germinate at low temperature
Keyword	abscisic acid [ Show all 16 ]

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