《Table 4–Genomic resources in chickpea and pigeonpea.》

  提示：宽带有限、当前游客访问压缩模式

本系列图表出处文件名：随高清版一同展现

《Integrated physiological and molecular approaches to improvement of abiotic stress tolerance in two pulse crops of the semi-arid tropics》

1. 获取 高清版本忘记账户？点击这里登录

1. 下载图表忘记账户？点击这里登录

The mechanism of“escape”has been widely used to mitigate the effects of terminal drought and heat stresses in breeding for earliness in both chickpea and pigeonpea.Genotypes/donors capable of escaping these abiotic stresses are available（Table 2）for use in breeding programs.For mitigating actual drought stress，only avoidance traits such as high root biomass（length and density），plant type（spreading），leaf traits（LAI），and presence of cuticular wax on leaves have been used in conventional breeding.However，only a few varieties in these two pulse crops tolerate low tissue water potential.Despite the fact that WL stress causes high（10%–65%）mortality in chickpea at flowering stage[9]，no appreciable WL tolerance has been reported in chickpea.In pigeonpea，a few WL-tolerant donors/lines and hybrids have been screened in medium-and long-duration pigeonpea.However，no progress has been reported in early pigeonpea，which suffers the most from WL stress.Even attempts to escape WL stress through breeding“super-early”types[129]have shown little success owing to high yield penalties associated with earliness.Several chickpea cultivars including‘JG 14’withstand terminal heat stress up to 35°C.Although some genotypes capable of surviving and bearing fertile pollen above this limit have been identified，pod development and seed setting has always been very poor owing to the complex physiological mechanisms of fertilization and seed development.Pigeonpea cultivars（Bahar，IPA 203）producing flowers and setting pods at average temperatures as low as 11°C（Tmin5°C–Tmax17°C）have been identified.However，genotypes setting pods at even lower temperatures（Tmin2°C–Tmax15°C）are needed to overcome the problem of second flush in the northeast plains of India.For salinity tolerance，only limited attempts have been made to breed cultivars in both chickpea and pigeonpea.Even salinity-tolerant cultivars of chickpea（e.g.，CSG 8962）have never occupied high acreage in problem areas，owing to their low realized yield.A similar situation holds for Al toxicity.