植物におけるイソプロチオランの生長調節作用(1) : イネの初期生育における根の生長に対するイソプロチオランの生理作用

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  • Growth regulating action of isoprothiolane in plant. I. Physiological action of isoprothiolane on the root growth of seedling stage in rice.
  • 植物におけるイソプロチオランの生長調節作用　Ｉ　　イネの初期生育におけるイソプロチオランの生理作用
  • ショクブツ ニ オケル イソプロチオラン ノ セイチョウ チョウセツ サヨウ

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Isoprothiolane (diisopropyl-1, 3-dithiolan-2-ylidenemalonate, IPT) is a compound originally developed as a systemic fungicide to control rice blast disease. VVe investigated the growth regulating effect of IPT on rice seedling, especially on root growth. The results obtained are summarized as follows : 1. When the germinated rice (cv. Nipponbare) seeds were induced on agar medium containing various concentrations of IPT at 25°C, it remarkably promoted the growth of seminal root dependent on the conc(tntration from 10-6 to 10-4M. IPT also promoted notably the growth of crown root, too, at 10-5 and 10-4M. On the other hand, the plant hcight and second leaiA sheath were inhibited by IPT at high concentrations above 10-4M (Fig.2). 2. The promoting effct of seminal root growth by IPT shit-ted low concentration sides by reducing the incubation temperature in steps (20, 18 and 16°C). That is, 10-6 and 10-5M IPT promoted the seminal root growth without eflbctiveness for plant height at 16°C. We also observed that this compoLlnd hastened the elongation of crown roots (Figs. 3, 4). 3. The in vitro root-tip (1cm long) culture in modified Kawatas' liquid medium exhibited that IPT also promoted the elongation of excised seminalroot at 10-6 and 10-5M, and inhibited its clongation and secondary root development at high concentration above 10-4M (Figs. 5, 6). The original part ofinoculated root-tip tissue cultured in the medium containing IPT remained to be white color with brown in control even after three weeks. This excised root part which was immersed in hydrochloric acid-phloroglucinol mixture fbr the detection of lignification faded rose color compared with control one ( Figs. 6, 7). From these results, it is clear that IPT is directly associated with root metabolism and promotes its growth. IPT may take part in maintenance and buildup of root activity under low temperature in rice seedlings.

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