Pre-attachment Striga hermonthica resistance of New Rice for Africa (NERICA) cultivars based on low strigolactone production
Pre-attachment Striga hermonthica resistance of New Rice for Africa (NERICA) cultivars based on low strigolactone production
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DOI：
10.1111/j.1469-8137.2011.03850.x
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发表时间：
2011-12-01
期刊：
影响因子：
9.4
通讯作者：
Bouwmeester, Harro J.
中科院分区：
文献类型：
--
作者：
Jamil, Muhammad;Rodenburg, Jonne;Bouwmeester, Harro J.
稻纵卷叶蛾(Striga Hermonthica)是一种专性半寄生杂草，在整个撒哈拉以南非洲地区造成包括水稻在内的谷物严重减产。百里香的萌发依赖于寄主根分泌的千里内酯(发芽刺激剂)。种间非洲新水稻(NERICA)品种为筛选低萌发诱导性水稻品种提供了一个潜在的有趣的基因库。结果表明，NERICA 1和CG14的稻瘟病菌发芽率、贴壁率和出苗率均显著低于NERICA 1和CG14。NERICA 7、8、11和14产生最多的链内酯类化合物，并且表现出最严重的链球菌感染。在所有品种和亲本中，分泌物中的链内酯含量与稻穗萌发、附着和出苗率呈正相关，表明稻瘟病菌附着前抗性存在遗传变异。将这种附着前抗性和附着后抗性(已经确定)相结合的栽培品种可以为撒哈拉以南非洲谷物生产系统中这种有害杂草的持久综合管理提供关键组成部分。
Striga hermonthica (Striga) is an obligate hemiparasitic weed, causing severe yield losses in cereals, including rice, throughout sub-Saharan Africa. Striga germination depends on strigolactones (germination stimulants) exuded by the host roots. The interspecific New Rice for Africa (NERICA) cultivars offer a potentially interesting gene pool for a screen for low germination-inducing rice cultivars.Exudates were collected from all NERICA cultivars and their parents (Oryza sativa and Oryza glaberrima) for the analysis of strigolactones. In vitro and in situ Striga germination, attachment and emergence rates were recorded for each cultivar.NERICA 1 and CG14 produced significantly less strigolactones and showed less Striga infection than the other cultivars. NERICAs 7, 8, 11 and 14 produced the largest amounts of strigolactones and showed the most severe Striga infection. Across all the cultivars and parents, there was a positive relationship between the amount of strigolactones in the exudate and Striga germination, attachment and emergence rates.This study shows that there is genetic variation in Striga pre-attachment resistance in NERICA rice. Cultivars combining this pre-attachment resistance with post-attachment resistance (already identified) can provide a key component for durable integrated management of this noxious weed in cereal production systems in sub-Saharan Africa.