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Jiangtao Fan,Jingyan Wang,Xianzhi Liu,Changping Zhao,Chaobing Zhou,Tasheen Saba,Jiaojiao Wu,Wenkai Hui,Wei Gong 한국원예학회 2022 원예과학기술지 Vol.40 No.3
Zanthoxylum armatum, known as green prickly ash, is a major condiment species planted on a large scale in southwest China. However, its limited cold tolerance has been a significant disadvantage for its cultivation in low-temperature regions. To better understand the antioxidant enzyme activities related to cold resistance, superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) activities as well as malondialdehyde (MDA) content were investigated under 16 fertilizer and soil moisture treatments to explore the cold resistance response mechanism in Z. armatum. The results showed that low temperatures could significantly affect antioxidant enzyme activities in the leaves of Z. armatum seedlings. The antioxidant enzyme activities of seedlings treated with soil moisture and fertilizer treatments were significantly higher than those without fertilizer. Furthermore, the comprehensive evaluation index (CEI) was positively correlated with SOD, POD, and CAT activities but negatively correlated with MDA content. Meanwhile, the treatment T12 (60% field water capacity + 300 kg·ha-1 nitrogen + 30 kg·ha-1 phosphoric anhydride) had the highest CEI value, whereas T1 (20% water capacity) had the lowest. Based on the regression equation for CEI improvement, the predicted optimal levels for field water capacity (FWC), nitrogen, phosphorus, and potassium were 59.6%–63.4% FWC (average 61.5%), 114.2–248.8 kg N/ha (average 181.5 kg N/ha), 40.1–108.5 kg P2O5/ha (average 74.3 kg P2O5/ha), and 200.2–254.4 kg K2O/ha (average 227.3 kg K2O/ha), respectively. The present study provides the optimal soil moisture and fertilizer concentration required to enhance protective enzyme activity and low-temperature tolerance, which is crucial for improving cold resistance in Z. armatum.
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