PJB-2017-129
IMPACT OF VERTICILLIUM DAHLIAE TOXIN ON MORPHOGENETIC, PHYSIOLOGICAL AND BIOCHEMICAL CHARACTERISTICS OF UPLAND COTTON
N. BIBI, F. LI, I.M. AHMED, K. FAN, S.N. YUAN AND X.D. WANG
Abstract
To obtain insights into the mechanism of Verticillium wilt, we elucidated the effects of Verticillium dahliae toxin (Vd toxin) on physiological and biochemical responses of the upland cotton (Gossypium hirsutum L.). Our results demonstrated that Vd toxin significantly (P<0.05) decreased the nutrition uptake up to 75% in NIAB-846, 70% in Zheda B, 63% in Zheda R, 56% in NIAB-111 and 34% in NIAB-999 than non-treated control. Significant reduction was observed in root growth parameters like root surface area, root length, root diameter and root volume. Further, Vd toxin treatment triggered the levels of superoxide dismutase (SOD), while reduced the contents of ascorbate (ASA) and reduced glutathione (GSH). However, the magnitudes of decrease in antioxidants values were lower in NIAB-999 resulting relatively low accumulation of malondialdehyde (MDA) as compared with other genotypes. In addition, the toxic effects of 24 h Vd toxin treatment were persistent even after two weeks of its removal and resulted in suppressed plant growth. According to integrated score, cotton genotypes were categorized for relative tolerance against Verticillium wilt in an order of NIAB-999 > NIAB-111 > Zheda R > Zheda B > NIAB-846. Our findings indicated that utilization of Vd toxin is environmentally friendly approach and nutrition uptake by plant might be a valuable tool for the screening of cotton genotypes against Verticillium wilt.
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