Physiological and Biochemical Responses of Maize to Gray Leaf Spot Stress

doi:10.7668/hbnxb.20193073

Abstract

Abstract:

To investigate the physiological and biochemical responses of maize to gray spot stress.Using the natural inoculation method in the field,two inbred lines K365(resistant)and K169(susceptible)and two hybrids Zhenghong 431(resistant)and Zhenghong 532(susceptible)were used as test materials.To study the effects of gray spot disease on leaf photosynthesis,reactive oxygen species content,antioxidant enzyme activity and endogenous hormone content of different resistant maize inbred lines and hybrids.Gray leaf spot stress led to the decrease of net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO₂ concentration (Ci) and transpiration rate (Tr) of maize leaves, except for Ci, the three photosynthetic indexes of resistant materials did not decrease significantly, specifically, Pn, Gs and Tr of K365 decreased by 24.41%,25.00% and 4.20%, respectively. The Pn, Gs and Tr of positive Zhenghong 431 decreased by 11.53%, 21.43% and 0.06%, respectively, while the three photosynthetic indexes of susceptible material decreased significantly, specifically, Pn, Gs and Tr of K169 decreased 59.32%, 95.28% and 80.18%, respectively. The Pn, Gs and Tr of Zhenghong 532 decreased by 85.39%, 69.60% and 56.77%, respectively;at the same time, the content of hydrogen peroxide (H₂O₂), peroxidase (POD) activity, superoxide dismutase (SOD) activity, catalase (CAT) activity, salicylic acid (SA) content, and jasmonic acid (JA) in maize leaves were increased under leaf gray spot stress, and the resistant materials could stimulate higher POD,SOD and CAT activities,maintaining a relatively stable H₂O₂ content,more reasonable regulation of SA and JA content,could maintain the balance of endogenous hormones.Resistant material may through rational accumulation of SA,JA signaling molecules to regulate antioxidant system,late in the disease still maintain a high level of defense enzymes in the body to more effectively remove excess H₂O₂,at the same time,adjust the blade endogenous hormone balance to make it adapt to the effects of resistant,thus to enhance maize disease resistance.

Key words: Maize, Gray leaf spot, Photosynthesis, Antioxidant enzyme, Endogenous hormone

ZHAO Siqi, QUBI Wuhe, LUO Ting, YU Xuejie, KE Yongpei, GOU Qixian, SHI Haichun. Physiological and Biochemical Responses of Maize to Gray Leaf Spot Stress[J]. Acta Agriculturae Boreali-Sinica, 2022, 37(4): 190-197. doi: 10.7668/hbnxb.20193073.

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Figures/Tables 7

Tab.1 Effects of gray spot stress on photosynthetic characteristics of maize

材料 Material	净光合速率/ (μmol/(m²·s)) Pn		气孔导度/ (mol/(m²· s)) Gs		胞间CO₂浓度/ (μmol/mol) Ci		蒸腾速率/ (mmol/(m²·s)) Tr
材料 Material	前Before	后After	前Before	后After	前Before	后After		前Before		后After
K169	2.31±0.56a	0.94±0.50b	0.228±0.036a	0.011±0.001b	432±5a	231±36b	6.45±0.60a		1.28±0.10b
K365	2.13±0.47a	1.61±0.44a	0.020±0.004a	0.015±0.004a	345±24a	210±7b	1.19±0.19a		1.14±0.13a
正红532 ZH532	4.44±0.37a	0.65±0.20b	0.044±0.012a	0.013±0.000b	370±20a	339±33a	2.31±0.52a		1.00±0.06b
正红431 ZH431	3.21±0.22a	2.84±0.85a	0.028±0.003a	0.022±0.009a	328±7a	281±32b	1.48±0.18a		1.48±0.40a

Fig.1 Effects of gray spot stress on H₂O₂ content of maize materials with different resistance Different small letters in the figure indicate that the susceptible materials have significant difference at different time(P<0.05); different capital letters indicate that the resistant materials have significant difference at different time(P<0.05).The same as Fig.2-6.

Fig.2 Effects of gray spot stress on POD activity of maize materials with different resistance

Fig.3 Effects of gray spot stress on SOD activity of maize materials with different resistance

Fig.4 Effects of gray spot stress on CAT activity of maize materials with different resistance

Fig.5 Effects of gray spot stress on SA content in maize with different resistance

Fig.6 Effects of gray spot stress on JA content in maize with different resistance

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