Mapping QTLs and candidate genes for rice root traits under different water-supply conditions and comparative analysis across three populations.
In: Theoretical & Applied Genetics, Jg. 107 (2003-11-15), Heft 8, S. 1505-1515
Online
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Zugriff:
To investigate the genetic factors underlying constitutive and adaptive morphological traits of roots under different water-supply conditions, a recombinant inbred line (RIL) population derived from a cross between the lowland rice variety IR1552 and the upland rice variety Azucena with 249 molecular markers, was used in cylindrical-pot experiments. Eighteen QTLs were detected for seminal root length (SRL), adventitious root number (ARN), and lateral root length (LRL) and lateral root number (LRN) on the seminal root at a soil depth of from 3 to 6 cm under flooding and upland conditions. One identical QTL was detected under both flooding and upland conditions. The relative parameters under the two water-supply conditions were also used for QTL analysis. Five QTLs for upland induced variations in the traits were detected with the positive alleles from Azucena. A comparative analysis was performed for the QTLs detected in this study and those reported from two other populations with Azucena as a parent. Several identical QTLs for root elongation were found across the three populations with positive alleles from Azucena. Candidate genes were screened from ESTs and cDNA-AFLP clones for comparative mapping with the detected QTLs. Two genes for cell expansion, OsEXP2 and endo-1,4-β-D-glucanase EGase, and four cDNA-AFLP clones from root tissues of Azucena, were mapped on the intervals carrying the QTLs for SRL and LRL under upland conditions, respectively. [ABSTRACT FROM AUTHOR]
Titel: |
Mapping QTLs and candidate genes for rice root traits under different water-supply conditions and comparative analysis across three populations.
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Autor/in / Beteiligte Person: | Zheng, B. S. ; Yang, L. ; Zhang, W. P. ; Mao, C. Z. ; Wu, Y. R. ; Yi, K. K. ; Liu, F. Y. ; Wu, P. |
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Zeitschrift: | Theoretical & Applied Genetics, Jg. 107 (2003-11-15), Heft 8, S. 1505-1515 |
Veröffentlichung: | 2003 |
Medientyp: | academicJournal |
ISSN: | 0040-5752 (print) |
DOI: | 10.1007/s00122-003-1390-1 |
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