Structural requirements of strigolactones for germination induction and inhibition of Striga gesnerioides seeds
Structural requirements of strigolactones for germination induction and inhibition of Striga gesnerioides seeds
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DOI：
10.1007/s00299-013-1429-y
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发表时间：
2013-06-01
影响因子：
6.2
通讯作者：
Sugimoto, Yukihiro
中科院分区：
文献类型：
--
作者：
Nomura, Saki;Nakashima, Hitomi;Sugimoto, Yukihiro
对独脚金内酯和刺尾草种子萌发的构效关系研究揭示了其萌发诱导的严格结构要求和植物激素作为萌发抑制剂的新功能。制备了天然独脚金内酯、独脚金内酯、高梁金内酯、山凤尾醇、高梁金内酯和5-脱氧独脚金内酯共36个立体异构体，并对分别寄生于高粱和豇豆的成熟植株上的hermonthstriga和genergenerioides种子进行了诱导和抑制萌发能力的筛选。所有化合物均能诱导红月子种子萌发，但表现出不同的活性。另一方面，只有有限数量的化合物能显著地在S. genererioides中萌发，从而表明严格的结构要求。独角麦内酯诱导的高萌发率诱导的低萌发率。C3a、C8b和C2′位构型与5-脱氧马曲糖醇（9a）位构型相同的马曲糖内酯能促进红月子种子的萌发，但多数抑制粗草种子的萌发。这种对独角酯内酯的不同反应可能对该物种的生存起着重要的作用。如果采用豇豆和高粱混作，这些化合物可以作为防治手段。
Structure-activity relationship studies of strigolactones and Striga gesnerioides seed germination revealed strict structural requirements for germination induction and a new function of the plant hormones as germination inhibitors.Stereoisomers of the naturally occurring strigolactones, strigol, sorgolactone, orobanchol, sorgomol and 5-deoxystrigol, 36 in total, were prepared and screened for the ability to induce and/or inhibit the germination of Striga hermonthica and Striga gesnerioides seeds collected from mature plants that parasitized on sorghum and cowpea, respectively. All of the compounds induced S. hermonthica seed germination, albeit displayed differential activities. On the other hand, only a limited number of the compounds induced significant germination in S. gesnerioides, thus indicating strict structural requirements. Strigolactones inducing high germination in S. gesnerioides induced low germination in S. hermonthica. Strigolactones with the same configuration at C3a, C8b and C2' as that in 5-deoxystrigol (9a) induced high germination of S. hermonthica seeds, but most of them inhibited the germination of S. gesnerioides. The differential response of S. gesnerioides to strigolactones may play an important role in the survival of the species. However, the compounds could be used as means of control if mixed cropping of cowpea and sorghum is adopted.