期刊
JOURNAL OF GENETICS AND GENOMICS
卷 36, 期 3, 页码 173-183出版社
SCIENCE PRESS
DOI: 10.1016/S1673-8527(08)60104-6
关键词
introgression lines; phosphorous deficiency tolerance; QTL mapping; rice; root traits
资金
- Hi-Tech Research and Development Program of China [2006AA10Z158, 2006AA100101]
- 948 Project [2006-G1]
- China National Key Technologies R D Program [2006BAD13B01-6]
- Program for Chang Jiang Scholars and Innovative Research Team in University
- Program of Introducing Talents of Discipline to Universities in China [111-2-03]
Phosphorous (P) deficiency is a major restraint factor for crop production and plants have developed several mechanisms to adapt to low P stress. In this study, a set of 271 introgression lines (ILs) were used to characterize the responses of seedlings to low P availability and to identify QTLs for root traits, biomass, and plant height under P-deficiency and P-sufficiency conditions. Plant height, total dry weight, shoot dry weight, and root number were inhibited under P-deficiency, whereas maximum root length (MRL) and root-shoot ratio (RS) were induced by P-deficiency stress. Relative MRL (RMPL, the ratio of MRL under P-deficiency to MRL under P-sufficiency condition) and relative RS (RRS) were used to evaluate P-deficiency tolerance at the seedling stage. A total of 24 additive QTLs and 29 pairs of epistatic QTLs were detected, but only qRN4 was detected in both conditions. This suggested that different mechanisms may exist in both P supply levels. QTLs for adaptive traits (RMRL, RRS, RRV, and RRDW) and qRN4 consistently expressed to increase trait stability may contribute to P-deficiency tolerance. Twelve intervals were cluster regions of QTLs for P-deficiency tolerance, and one QTL (qRRS8) showed pleiotropic effects on P-deficiency tolerance and drought tolerance. These interesting QTLs can be used in marker-assisted breeding through the target ILs.
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