| Photosynthetic and physiological characteristics of two rootstock combinations with Changfu 2 as scion under saline\|alkali stress |
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| DOI：10.7606/j.issn.1000-7601.2020.02.25 |
| Key Words: combined saline\|alkali stress rootstock combination apple stress physiology photosynthesis |
| Author Name | Affiliation | | GAO Liyang | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | JIA Xumei | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHU Zulei | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHAO Tong | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LIU Bing | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Rui | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Xiayi | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | HUANG Zongchang | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | WANG Yanxiu | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| The rootstocks of ‘Malus halliana Koehne’ (cs) and ‘Malus hupehensis’ (py) were grafted with ‘Chang fu 2’ (fs) as the potting experiment materials, and irrigated by Hoagland nutrient solution with salt (100 mmol·L -1, NaCl and NaHCO3 mixed in molar ratio 1∶1). The effects of saline\|alkali stress on photosynthesis, antioxidant enzymes and osmoregulation of two scion\|rootstock were studied. The results showed that with the prolongation of stress time, the chlorophyll synthesis of the two combinations was blocked, the photosynthetic electron transport was suppressed, and the osmotic regulation and antioxidant enzyme system were destroyed. Among them, the photosynthetic capacity of cs+fs was better than that of py+fs, the net photosynthetic rate of cs+fs and py+fs decreased by 8.31% and 45.88%, respectively, when stressed to 40 days, and the peak value of SOD, POD activity, and Pro content of cs+fs appeared 10 days later than that of py+fs, and the peak value was 21.04%, 15.94%, and 99.03% higher than that of py+fs, respectively. After stressed 40 days, the chlorophyll a+b, Pn,Gs, and Tr of cs+fs were 178.49%, 92.12%, 296.64%, and 38.20% higher than those of py+fs, respectively, while Ci was 27.92% lower than py+fs. The SOD, POD activity, and Pro content of cs+fs were 45.71%, 17.96%, and 114.50% higher than those of py+fs, respectively. In summary, under combined salt\|alkali stress, photosynthetic capacity, scavenging reactive oxygen species, osmotic adjustment, and heat dissipation protection of cs+fs were stronger than those of py+fs. Therefore, the salt\|alkali tolerant ability of cs+fs was better than that of py+fs. |
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