首页|硅锰互作对红锥幼苗生长生理的影响

硅锰互作对红锥幼苗生长生理的影响

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为探究硅和锰对红锥(Castanopsis hystrix)幼苗的影响,测定不同浓度硅和锰处理下红锥幼苗的生长生理特性指标.结果表明,仅添加锰或硅的处理中,随着硅或锰浓度增加,红锥幼苗株高和地径相对增量、根系形态指标、超氧化物歧化酶(superoxide dismutase,SOD)、过氧化物酶(peroxidase,POD)、过氧化氢酶(catalase,CAT)和抗坏血酸过氧化物酶(ascorbate peroxidase,APX)活性均先升高后降低;丙二醛(malondialdehyde,MDA)含量则相反.低浓度锰(200、600 μg/g)或硅(500、1 000 μg/g)对红锥幼苗生长发育有利,但高浓度锰(1 500、3 000 μg/g)或硅(2 000 μg/g)表现为抑制.适量硅(500、1 000 μg/g)能缓解高浓度锰的胁迫作用,使受到抑制的红锥幼苗生长生理指标得到改善,但过量硅(2 000 μg/g)加剧了胁迫.适量硅和锰同时添加可促进红锥幼苗的生长发育,其中同时添加 600 μg/g 锰和500 μg/g 硅的处理效果最佳;高浓度的硅和锰同时添加则导致严重的抑制.红锥具有一定耐锰性(锰的添加范围为1 500 μg/g以内),广西部分区域锰矿具有红锥的生产培育和生态林应用潜力.
Effects of Silicon and Manganese on the Growth and Physiology of Castanopsis hystrix
To explore the effects of silicon and manganese on Castanopsis hystrix seedlings,the growth and physiological characteristics of seedlings treated with different concentrations of silicon and manganese were measured.The results showed that:the relative increase in plant height and ground diameter,the root morphological index,and the SOD,POD,CAT,and APX activities of red cone-shaped plants increased first but then decreased with increasing concentration in the Mn or Si treatment and the presence of MDA contrast agent.Low concentrations of Mn(200,600 μg·g-1)or Si(500,1 000 μg·g-1)were beneficial to the growth and development of red cone-shaped plants,but high concentrations of Mn(1 500,3 000 μg/g)or Si(2 000 μg·g-1)were inhibitory.An appropriate amount of Si(500 or 1 000 μg·g-1)can alleviate the stress caused by a high concentration of Mn and improve physiological indices of inhibited growth.However,excessive Si(2 000 μg·g-1)aggravated the stress.The simultaneous addition of an appropriate amount of Si and Mn significantly promoted the growth and develop-ment of Castanopsis hystrix seedlings,of which 600 μg·g-1 Mn and 500 μg·g-1 Si were the best treatments.The addition of high concentrations of silicon and manganese resulted in severe inhibition.Castanopsis hystrix has a certain Mn tolerance(the Mn addition range is less than 1 500 μg·g-1).Mn ore in some areas of Guangxi has the potential for Castanopsis hystrix pro-duction cultivation and ecological forest application.

siliconmanganesegrowth indexphysiology indexCastanopsis hystrix seedlingstress

欧阳子龙、雷康、贾湘璐、滕维超、谭长强、申文辉

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广西优良用材林资源培育重点实验室/广西林业科学研究院 广西南宁 530002

广西大学 广西南宁 530004

南宁植物园 广西南宁 530002

南宁青秀山风景名胜旅游开发有限责任公司 广西南宁 530004

中南速生材繁育国家林业和草原局重点实验室 广西南宁 530004

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生长指标 生理指标 红锥幼苗 胁迫

广西优良用材林资源培育重点实验室开放课题

2020-B-02-01

2024

热带农业科学
中国热带农业科学院

热带农业科学

CSTPCD
影响因子:0.534
ISSN:1009-2196
年,卷(期):2024.44(5)
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