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树莓茎对低温胁迫的生理响应
Physiological Response of Rubus idaeus Stems to Cryogenic Stress
探究抗低温的野生树莓资源牛叠肚与低温敏感型树莓栽培品种抗寒性产生差异的原因,为选育抗寒品种提供理论依据。以野生树莓资源牛叠肚1号、牛叠肚2号和栽培品种‘波拉娜’、‘菲尔杜德’和‘海尔特兹’初生茎为试验材料,探究其在自然越冬过程中相对含水量、渗透调节物质、抗氧化酶活性以及膜透性的差异。同时应用主成分分析进行抗寒性综合评价。结果表明,牛叠肚茎相对含水量在自然越冬过程中变幅不大,2021年1月11日达到最低值47.77%,而树莓栽培品种茎相对含水量在低温期(1月11日)迅速下降,最低值仅为12.83%。树莓茎的SOD活性在越冬期波动变化,且野生资源牛叠肚SOD活性在越冬多数时期均显著高于栽培品种。牛叠肚茎可溶性蛋白含量、脯氨酸含量在越冬期显著高于树莓栽培品种,茎的相对电导率和MDA含量均显著低于树莓栽培品种。抗寒性由强到弱为牛叠肚2号、牛叠肚1号、‘波拉娜’、‘菲尔杜德’和‘海尔特兹’。野生树莓资源牛叠肚抗寒性明显优于树莓栽培品种,其原因主要在于低温胁迫下茎保水能力强,抗膜脂过氧化水平高,高渗透调节物质和抗氧化酶系统发挥了作用。
The paper aims to explore the reasons for the difference in cold resistance between wild Rubus idaeus resources with low temperature resistance and low temperature sensitive R. idaeus cultivars, and to provide theoretical basis for breeding cold-resistant varieties. At the same time, principal component analysis was used to evaluate the cold resistance. The primary stems of wild R. idaeus resources R. crataegifolius 1, R. crataegifolius 2, and cultivars of R. idaeus of ‘Polana’, ‘Fertodi’, and ‘Heritage’ were used as experimental materials to explore the differences in relative water content, osmotic adjustment substances, antioxidant enzyme activity and membrane permeability during natural overwintering. The relative water content of the stem of the R. crataegifolius did not change much during the natural overwintering process, and reached the lowest value of 47.77% on January 11, 2021, while the relative water content of the stem of the R. idaeus cultivar decreased rapidly during the low temperature period (January 11), and the lowest value was only 12.83%. The SOD activity of R. idaeus stems fluctuated during the overwintering period, and the SOD activity of wild resources was significantly higher than that of cultivated varieties during most overwintering periods. The soluble protein content and proline content of R. crataegifolius stems were significantly higher than those of R. idaeus cultivars during the overwintering period, and the relative conductivity and MDA content of stems were significantly lower than those of R. idaeus cultivars. The cold resistance from strong to weak was R. crataegifolius 2, R. crataegifolius 1, ‘Polana’, ‘Fertodi’, and ‘Heritage’. The cold resistance of wild R. idaeus resources is significantly better than that of R. idaeus cultivars, mainly due to the strong water retention capacity of stems, high resistance to membrane lipid peroxidation, and the role of high osmotic regulatory substances and antioxidant enzyme systems under low temperature stress.
树莓 / 茎 / 低温胁迫 / 生理特性 / 抗寒性 {{custom_keyword}} /
Rubus idaeus / stem / low temperature stress / physiological characteristics / cold resistance {{custom_keyword}} /
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