中国沙棘幼苗对土壤镉生理耐性和富集转运特征的性别差异
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甘肃省青年科技基金计划项目(20JR5RA007);甘肃省林业和草原局林草科技创新与合作项目(KJCX2021004);甘肃农业大学科技创新基金项目(GAU-XKJS-2018-100)


Gender Differences in Physiological Tolerance, Enrichment and Transport Characteristics of Hippophae rhamnoides subsp. sinensis Seedlings under Cadmium Treatment
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    摘要:

    为探究中国沙棘对土壤镉(Cd)胁迫的性别响应差异,该研究以中国沙棘2年生幼苗为材料,利用盆栽试验研究在不同浓度Cd处理下(0(CK)、25、50、100和200 mg·kg-1)雌、雄株幼苗的生长、叶片生理特性以及Cd富集特征的差异。结果表明:(1)Cd处理下中国沙棘幼苗雌、雄株的株高和基径生长以及各器官生物量均表现出低浓度(< 50 mg·kg-1)促进,高浓度(> 100 mg·kg-1)抑制的现象;低浓度Cd处理下雌株的株高、基径增长率和生物量的增幅均高于雄株;高浓度Cd处理下(200 mg·kg-1)雄株株高增长率、叶生物量和总生物量分别较CK显著降低,而雌株均未显著下降。(2)随着Cd浓度升高,雌、雄株叶片光合色素含量和抗氧化酶活性呈先升后降的变化趋势,丙二醛(MDA)和渗透调节物质含量呈上升趋势;Cd浓度为50~200 mg·kg-1时,雌株叶片的光合色素含量、抗氧化酶活性和渗透调节物质含量均高于雄株,而MDA含量始终低于雄株。(3)随着Cd浓度升高,雌、雄株各器官Cd含量均逐渐上升且表现为根>茎>叶,雌株各器官Cd含量均高于雄株;雌、雄株地上和地下部分富集系数呈先增后减的变化趋势且均大于1,转移系数逐渐降低且均小于1;雌株地上和地下部分Cd富集系数以及转移系数均高于雄株,且地上部分Cd富集系数在Cd浓度为25~100 mg·kg-1时显著高于雄株。研究发现,中国沙棘幼苗在土壤Cd浓度小于50 mg·kg-1时表现出一定的Cd耐受性,当土壤Cd浓度大于100 mg·kg-1时其Cd耐受性减弱,雌株对土壤Cd的生长适应性、生理耐性和富集转运能力较雄株强。

    Abstract:

    In order to explore the differences of gender response of Hippophae rhamnoides subsp. sinensis to cadmium (Cd) in soil, this study used biennial seedlings of H. rhamnoides subsp. sinensis as materials to study the differences in growth, leaf physiological characteristics and Cd accumulation characteristics of female and male seedlings under Cd concentration of 0(CK), 25, 50, 100 and 200 mg·kg-1. The results showed that: (1) under Cd treatment, the growth of plant height, basal diameter and biomass of female and male H. rhamnoides subsp. sinensis seedlings showed the phenomenon of low concentration (< 50 mg·kg-1) promotion and high concentration (> 100 mg·kg-1) inhibition. Under low concentration of Cd treatment, the growth rate of plant height, basal diameter and biomass of female seedlings were higher than those of males. Under high concentration of Cd treatment (200 mg·kg-1), the growth of plant height, the leaf biomass and the total biomass of male seedlings were significantly lower than those of CK, while those of female seedlings were not decrease significantly. (2) With the increasing of Cd concentration, the content of photosynthetic pigments and the activities of antioxidant enzymes in the leaves of female and male seedlings increased at first and then decreased, and the contents of malondialdehyde (MDA) and osmoregulation substances increased. When the Cd concentration was 50-200 mg·kg-1, the photosynthetic pigment content, antioxidant enzyme activities and osmoregulation substance contents in leaves of female seedlings were higher than those of males, while the MDA content was always lower than that of the males. (3) With the increasing of Cd concentration, the Cd content in various organs of female and male seedlings gradually increased and showed a trend of root > stem > leaf. The Cd content in various organs of female seedlings was higher than that of male seedlings. The bioconcentration factors (BCF) of aboveground and underground parts of female and male seedlings increased at first and then decreased, and all of them were higher than 1, while the translocation factors (TF) gradually decreased and were less than 1. The BCF and TF of aboveground and underground parts of female seedlings were higher than those of male seedlings. When the Cd concentration was 25-100 mg·kg-1, the BCF of aboveground parts was significantly higher than that of male seedlings. It was found that H. rhamnoides subsp. sinensis seedlings showed tolerance to Cd in certainly degree when the Cd concentration in soil was less than 50 mg·kg-1. When the Cd concentration in soil was higher than 100 mg·kg-1, the tolerance to Cd was weakened. The growth adaptability, physiological tolerance, enrichment and transport capacity of female seedlings to Cd in soil were stronger than male seedlings.

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马永龙,朱 珠,王艳莉,等.中国沙棘幼苗对土壤镉生理耐性和富集转运特征的性别差异[J].西北植物学报,2023,43(2):285-294

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  • 在线发布日期: 2023-03-09
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