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首页> 外文期刊>Plant Protection Science >Field resistance of crosses of sesame (Sesamum indicum L.) to charcoal root rot caused by Macrophomina phaseolina (Tassi.) Goid.
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Field resistance of crosses of sesame (Sesamum indicum L.) to charcoal root rot caused by Macrophomina phaseolina (Tassi.) Goid.

机译：芝麻（Sesamum indicum L.）杂交对菜豆（Macrophomina phaseolina（Tassi。）Goid）引起的木炭腐烂的田间抗性。

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Two segregating generations (F3 and F4) from 6 × 6 half-diallel crosses, excluding reciprocals, of a sesame breeding program were exposed to natural infection by the root rot pathogen (Macrophomina phaseolina) in two successive seasons (2004 and 2005). There was highly significant variability in the progeny of all investigated crosses which might be a valuable tool for further breeding programs for root rot disease management. The level of infection in 2004 ranged from 2.63% (cross P2 × P5) to 52.42% (P4 × P5) in the F3, and from 1.28% (P1 × P5) to 51.78% (P4 × P5) in the F4. During 2005, infection varied from 1.01% (P2 × P5) to 50.91% (P4 × P5) in the F3, and from 1.00% (P3 × P4) to 48.00% (P4 × P5) in the F4. These crosses were ranked resistant or highly susceptible and gave seed yields per feddan (= 4200 m) of 536.67, 361.67, 641.67, and 408.33, respectively. The F3’s and F4’s of five crosses, i.e. P1 × P2, P1 × P4, P1 × P5, P2 × P6, and P3 × P4, were resistant in both segregating generations and both seasons. Such crosses might be helpful for breeding programs due to their stable resistance. Lines from the crosses P1 × P6, P2 × P4 and P4 × P5 could also be used for improving resistance due to an increase of inherited resistance from one generation to another. The estimated heritability showed high values in all cases and indicated that selection for these traits could be useful for breeding programs for resistance to root rot with seed yield potential. Correlation coefficients showed that there were some positive correlations such as percentage of infection by M. phaseolina between both generations (F3’s and F4’s) as well as within each generation during a season’s evaluation, i.e. 0.742, 0.976, 0.846, 0.732, and 0.987. The highest significant and positive correlations assisted in the selection of some crosses to be used in breeding programs and will aid breeders to achieve sesame cultivars with charcoal root rot resistance.Keywords:sesame; root rot; Macrophomina phaseolina; disease resistance; seed yield; field conditionsdownload PDF Impact factor (Web of Science – Thomson Reuters) 2016: 0.742
机译：在两个连续的季节（2004年和2005年）中，芝麻育种计划的6×6个半圆角杂交的两个分离世代（F3和F4）（不包括倒数）被根腐病原菌（Macrophomina phaseolina）自然感染。在所有被调查的杂交后代中都存在非常显着的变异性，这可能是进一步根除腐烂病管理育种程序的宝贵工具。 F3在2004年的感染水平范围从2.63％（交叉P2×P5）到52.42％（P4×P5），从F4的1.28％（P1×P5）到51.78％（P4×P5）。在2005年期间，F3的感染率从1.01％（P2×P5）到50.91％（P4×P5），从F4的1.00％（P3×P4）到48.00％（P4×P5）。这些杂交被定为抗药性或高度易感等级，并且每个feddan（= 4200 m）的种子产量分别为536.67、361.67、641.67和408.33。 P1×P2，P1×P4，P1×P5，P2×P6和P3×P4这五个杂交的F3和F4在分离世代和两个季节均具有抗性。由于其稳定的抗性，这样的杂交对育种计划可能是有帮助的。由于从一代到另一一代的遗传抗性增加，来自十字架P1×P6，P2×P4和P4×P5的线也可用于提高抗性。估计的遗传力在所有情况下均显示出较高的值，并表明选择这些性状可能对具有种子产量潜力的根腐病抗性育种计划有用。相关系数表明，在一个季节的评估期间，两个世代（F3和F4）之间以及每个世代内的阶段性菜鸟支原体感染百分比都存在正相关，即0.742、0.976、0.846、0.732和0.987。最高的显着性和正相关性有助于选择育种程序中使用的杂交品种，并有助于育种者获得具有木炭根腐烂抗性的芝麻品种。根腐;巨噬性菜豆;抗病性种子产量现场条件下载PDF影响因子（Web of Science – Thomson Reuters）2016：0.742

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