Activities of cell wall peroxidases in relation to lignification in six wheat (Triticum aestivum L.) genotypes under heat and drought stress

作者：Bala S; Asthir B^*; Bains N S

来源：Journal of Environmental Biology, 2016, 37(3): 437-442.

• Coniferyl alcohol peroxidase
• Guaiacol peroxidase
• Lignin
• Syringaldazine peroxidase

Sensitivity of grain developmental stages to high temperature and drought stress was investigated in six wheat genotypes (PBW 343, PBW 621, PBW 550, PBW 175, C 306 and HD 2967) in terms of peroxidases induced lignification. Drought and high temperature accentuated activities of coniferyl alcohol peroxidase [(CPX) (3.4-5.9 m mol min(-1) g(-1) f.wt.)] and syringaldazine peroxidase [(SPX) (0.13-0.59 m mol mim(-1) g(-1) f.wt.)] and guaiacol peroxidase [(GPX) (0.11-0.59 m mol min(-1) g-(-1) f.wt.)]. Histochemical localization of lignin in certain cells of grains indicated involvement of DAO in the supply of H2O2 for CPX mediated lignification process. Higher build up of thiobarbituric acid reactive substances, especially in cultivars PBW 343 (45 in mol g(-1) f.wt.) and PBW 550 (50 m mol g(-1) f.wt.) indicated their membrane instability during stress. Results revealed that both stresses caused substantial induction of coniferyl peroxidases (3.4-5.9 m mol(-)min(-1) g(-1) f.wt.) to facilitate lignification. Differential genotypic response was observed under two stresses, C 306 and HD 2967 were resistant to heat stress, while PBM 175 and PBW 621 to drought stress.

• 出版日期2016-5