Quantitative trait loci for soil-penetrating ability of roots in durum wheat
Quantitative trait loci for soil-penetrating ability of roots in durum wheat
复制标题
DOI：
10.1111/j.1439-0523.2007.01368.x
复制
发表时间：
2007-08-01
期刊：
影响因子：
2
通讯作者：
Jitsuyama, Y.
中科院分区：
文献类型：
--
作者：
Kubo, K.;Elouafi, L.;Jitsuyama, Y.
提高根部对硬土的渗透（RP）能力对于提高硬粒小麦的抗旱性非常重要。使用石蜡-凡士林 (PV) 圆片对源自“Jennah Khetifa”和“Cham1”杂交的 110 个重组自交系 (RIL) 中与 RP 能力相关的性状进行了评估。对穿透PV盘的根数(PVRN)、种子根和冠根总数(TRN)、RP指数(PVRN/TRN)和根干重(DW)进行QTL分析。 'Jennah Khetifa' 的 PVRN、RP 指数和根 DW 值均高于 'Cham1'，并且这些性状的 RIL 表现出显着差异。 6A 染色体长臂上两个紧密连锁的标记 Xgwin6l7a 和 Xgwm427b 与 PVRN 和 RP 指数相关。对于根 DW，QTL 与 11B 染色体上的标记 Xgwm11 连锁。 “Jennah Khetifa”等位基因与 PVRN、RP 指数和根 DW 增加相关。在此作图群体中未检测到 TRN 的 QTL。共定位 QTL 的缺失表明 RP 能力与 TRN 和根 DW 分开控制。尽管群体规模和复制次数都很小，但这项研究有助于了解根系生长的复杂性以及标记辅助选择在硬粒小麦群体中选择具有高 RP 能力的基因型的潜力。
Increasing root penetration (RP) ability into hard soil is important to improve drought resistance in durum wheat. Traits related to RP ability were evaluated in 110 recombinant inbred lines (RILs) derived from a cross between 'Jennah Khetifa' and 'Cham1' using paraffin-Vaseline (PV) discs. QTL analyses were made for the number of roots penetrating the PV disc (PVRN), total number of seminal and crown roots (TRN), RP index (PVRN/TRN) and root dry weight (DW). 'Jennah Khetifa' had higher PVRN, RP index and root DW values than 'Cham1', and the RILs showed significant differences for these traits. Two closely-linked markers, Xgwin6l7a and Xgwm427b, on the long arm of chromosome 6A were associated with PVRN and RP index. For root DW, a QTL was linked to marker Xgwm11 on chromosome 11B. Alleles of 'Jennah Khetifa' were associated with increased PVRN, RP index and root DW. No QTL was detected for TRN in this mapping population. The absence of co-located QTLs suggested that RP ability was controlled separately from TRN and root DW. Although the population size and number of replications were small, this study helps in understanding the complexity of root growth and the potential of marker-assisted selection for selecting genotypes with high RP ability in durum wheat populations.