Anbessa Y, Warkentin T, Vandenberg A, Ball R
Department of Plant Sciences, University of Saskatchewan, Saskatoon, SK, Canada S7N 5A8.
J Hered. 2006 Jan-Feb;97(1):55-61. doi: 10.1093/jhered/esj009. Epub 2006 Jan 4.
Time to flowering is central in determining the adaptation and productivity of chickpea in short-season temperate environments. We studied the genetic control of this trait in three crosses, 272-2 x CDC Anna, 298T-9 x CDC Anna, and 298T-9 x CDC Frontier. From each cross, 180 F2 plants and parents were evaluated for time to flowering under greenhouse conditions. In summer 2004, multiple generations including P1, F1, P2, F2, and F2:3 (also called MG5) were evaluated for time to flowering under field conditions. The data on time to flowering in the F(2) populations were continuous in distribution but deviated from normal distribution. The F2:3 families derived from this showed a bimodal distribution for time to flowering, a typical case of major-gene inheritance model with duplicate recessive epistasis. A joint segregation analysis of MG5 also revealed that time to flowering in chickpea was controlled by two major genes along with other polygenes. Late flowering was dominant over early flowering for both major genes with digenic interaction between them, mainly an additive x additive type. This information can be used to formulate the most efficient breeding strategy for improvement of time to flowering in chickpea in short-season temperate environments.
开花时间对于决定鹰嘴豆在短季节温带环境中的适应性和生产力至关重要。我们在三个杂交组合（272-2×CDC Anna、298T-9×CDC Anna和298T-9×CDC Frontier）中研究了该性状的遗传控制。从每个杂交组合中选取180株F2植株和双亲，在温室条件下对开花时间进行评估。2004年夏季，对包括P1、F1、P2、F2和F2:3（也称为MG5）在内的多个世代在田间条件下的开花时间进行评估。F(2)群体中开花时间的数据呈连续分布，但偏离正态分布。由此衍生的F2:3家系的开花时间呈双峰分布，这是具有重复隐性上位性的主基因遗传模型的典型案例。对MG5的联合分离分析还表明，鹰嘴豆的开花时间由两个主基因以及其他多基因控制。两个主基因中晚花对早花均为显性，它们之间存在双基因互作，主要是加性×加性类型。这些信息可用于制定最有效的育种策略，以改善鹰嘴豆在短季节温带环境中的开花时间。
