Genetic variation in strigolactone production and tillering in rice and its effect on Striga hermonthica infection.
Genetic variation in strigolactone production and tillering in rice and its effect on Striga hermonthica infection.
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DOI：
10.1007/s00425-011-1520-y
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发表时间：
2012-03
期刊：
影响因子：
4.3
通讯作者：
Bouwmeester HJ
中科院分区：
文献类型：
--
作者：
Jamil M;Charnikhova T;Houshyani B;van Ast A;Bouwmeester HJ
谷类分蘖是一个复杂的调控过程，根中的信号也以植物内酯的形式发挥重要作用。草内酯是分泌到根际的信号分子，在那里它们作为根寄生植物的萌发刺激剂和丛枝菌根真菌的菌丝分枝因子。另一方面，它们也从根运输到枝条，在那里它们抑制分蘖或分枝。本研究对从世界各地收集的20个水稻品种的稻内酯产量和分蘖表型的遗传变异进行了研究，这些品种与稻瘟病菌侵染相关。水稻品种如IAC165、IAC1246、Gangweondo和Kinko产生大量的链内酯、2‘-环氧乙烷-5-脱氧雄酚和3个甲氧基-5-脱氧雄酚异构体，但分蘖数量较少。这些品种能诱导出较高的发芽率、贴壁率、出苗率和干生物量。相比之下，超级巴斯马蒂、TN1、阿纳基拉和Agee等水稻品种表现出高分蘖和低产量的组合。这些品种只能诱导低萌发、低附着、低出苗和低干生物量。通过对所有品种的统计分析，证实了马立内酯的产量与稻瘟病菌的侵染呈正相关，与分蘖呈负相关。这些结果表明，分蘖能力的遗传变异是稻瘟菌内酯生产的遗传变异的结果，因此可以作为选择不受稻瘟病菌侵染的水稻品种的有用工具。本文的在线版本(doi：10.1007/s00425-0111520-y)包含补充材料，授权用户可以使用。
Tillering in cereals is a complex process in the regulation of which also signals from the roots in the form of strigolactones play an important role. The strigolactones are signalling molecules that are secreted into the rhizosphere where they act as germination stimulants for root parasitic plants and hyphal branching factors for arbuscular mycorrhizal fungi. On the other hand, they are also transported from the roots to the shoot where they inhibit tillering or branching. In the present study, the genetic variation in strigolactone production and tillering phenotype was studied in twenty rice varieties collected from all over the world and correlated with S. hermonthica infection. Rice cultivars like IAC 165, IAC 1246, Gangweondo and Kinko produced high amounts of the strigolactones orobanchol, 2′-epi-5-deoxystrigol and three methoxy-5-deoxystrigol isomers and displayed low amounts of tillers. These varieties induced high S. hermonthica germination, attachment, emergence as well as dry biomass. In contrast, rice cultivars such as Super Basmati, TN 1, Anakila and Agee displayed high tillering in combination with low production of the aforementioned strigolactones. These varieties induced only low S. hermonthica germination, attachment, emergence and dry biomass. Statistical analysis across all the varieties confirmed a positive correlation between strigolactone production and S. hermonthica infection and a negative relationship with tillering. These results show that genetic variation in tillering capacity is the result of genetic variation in strigolactone production and hence could be a helpful tool in selecting rice cultivars that are less susceptible to S. hermonthica infection. The online version of this article (doi:10.1007/s00425-011-1520-y) contains supplementary material, which is available to authorized users.
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