عنوان مقاله [English]
Autotoxicity is a negative auto-allelopathy which has been observed in different plant species including rice. To evaluate autotoxic potential of root exudates in four rice Iranian cultivars including Hassansara, Hashemi, Champa, and Ali Kazemi, an experiment was conducted using donor and receiver cultivars culturing on 0.4% agar medium. Receiver plantlets were planted on agar in a concentric circles pattern aroud donar plantlets in 2, 4 and 6 cm intervals after donors seven days establishment. The plantlet indices such as radicle and plumule length, plantlet dry and fresh weight were recorded. The results are indicating negative effects of root exudates of Iranian rice cultivars on themselves and each other. The negative effect was more obvious on plantlets radicle then plumule growth. Root exudates of Hassansara had the highest negative impact on Champa plantlet growth. Plantlet fresh weight increased significantly in growing intervals of 2, 4, and 6 cm in all rice cultivars. Champa root exudate was more autotoxic than others regarding plantlet dry weigh. Therefore, using proper planting density in studied rice cultivar especially Champa has been suggested to get suitable yield in rice plantations.
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