Molecular dissection of seedling-vigor and associated physiological traits in rice

Cui, K.H. and Peng, S.B. and Xing, Y.Z. and Xu, C.G. and Yu, S.B. and Zhang, Q. (2002) Molecular dissection of seedling-vigor and associated physiological traits in rice. Theoretical and Applied Genetics, 105 (5). pp. 745-753.

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seedling-vigor is important for crop establishment. There have been reported quantitative trait locus (QTL) analyses on seedling-vigor related morphological traits. However, physiological understanding of these detected QTLs is rather limited. In this study, we employed a recombinant inbred population to detect QTLs for seedling-vigor traits and physiological traits related to seedling-vigor. Germination rate and seedling growth were measured to quantify seedling-vigor. Total amylase activity, α-amylase activity, reducing sugar content, root activity and seed weight were determined. Correlations were observed between the seedling-vigor and physiological traits. QTL analysis reveals that the intervals of RG393-C1087-RZ403 on chromosome 3, C246-RM26- C1447 and R830-R3166-RG360-C734b on chromosome 5, and the interval of Waxy on chromosome 6 are the four main chromosomal regions controlling seedlingvigor. Several QTLs for amylase activities, reducing sugar content and root activity were localized in the similar regions as the QTLs for seedling-vigor. The results suggest that these traits were under the control of pleiotropic and/or closely linked QTLs. The implications of the results in the understanding of the physiological basis of seedling-vigor were discussed

Item Type: Article
Subjects: Crop Improvement
Divisions: Other Crops
Depositing User: Syamala
Date Deposited: 15 Feb 2011 17:25
Last Modified: 15 Feb 2011 17:25
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