Root Biomass Partitioning, Differential Antioxidant System and Thiourea Spray are Responsible for Heat Tolerance in Spring Maize
Proceedings of the National Academy of Sciences, India Section B: Biological Sciences - Tập 87 - Trang 351-359 - 2015
Tóm tắt
Seedling growth and antioxidative defense system were studied in two spring maize (Zea mays L.) genotypes viz., CML 32 (relatively heat tolerant) and LM 11 (relatively heat susceptible), under heat stress (40 °C). Heat stress induced higher mobilization of biomass towards roots in CML32 genotype leading to increased root to shoot biomass ratio. The susceptible genotype showed decreased root to shoot length and dry biomass ratios which could be responsible for its decreased resistance towards heat stress. The higher peroxidase activity induced in the roots and shoots of CML 32 genotype, under stress conditions could be responsible for its enhanced tolerance levels. In addition, the increased activities of catalase, ascorbate peroxidase and glutathione reductase in the roots of CML 32 seedlings as compared to those of LM-11, further improved the stress tolerance of the genotype. Foliar spray of 6 mM thiourea brought the ratio of root to shoot growth in terms of length and dry biomass, back to normal values. Thiourea specifically upregulated the activities of catalase and peroxidase in the roots and shoots of both the genotypes, thus improving the H2O2 scavenging efficiency of the system. Thus, differential biomass partitioning, increased catalase activity and an active ascorbate–glutathione cycle could be responsible for mitigating the effects of heat stress. Besides, increased peroxidase activity in the roots and shoots of CML 32 as compared to those of LM 11, under control, heat stress and thiourea spray + heat stress consecutively ameliorate the stress tolerance efficiency of CML 32 seedlings.
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