干旱胁迫对喀斯特地区野生茶树幼苗生理特性及根系生长的影响

发布时间：2018-05-24 05:40

  本文选题：干旱胁迫 + 野生茶树　； 参考：《生态学报》2017年21期

【摘要】：以贵州喀斯特地区4种野生茶树(Sect Thea(L.)Dyer)无性系幼苗为材料,采用盆栽控水方法研究其对干旱胁迫的生理生长响应,初步评价其抗旱性,并采用田间模拟持续干旱试验进行验证。结果表明:(1)随着干旱胁迫程度的加强,4种野生茶树叶片的相对含水量逐渐降低;细胞质膜透性、丙二醛(MDA)含量和可溶性糖含量均呈上升趋势;游离脯氨酸含量和超氧化物歧化酶(SOD)活性先升后降;过氧化物酶(POD)活性除秃房茶随胁迫程度加强呈上升趋势外,其他种均呈先升后降趋势。(2)随着干旱胁迫程度的加强,4种茶树幼苗总生物量干重均逐渐下降,根冠比先升后降;根系总长除在秃房茶中呈先升后降趋势外,在其他3个种中均逐渐下降;根系总表面积、根系总体积在大理茶和茶中逐渐下降,而在大厂茶和秃房茶中先升后降;根系平均直径在秃房茶中逐渐降低,大厂茶中先升后降,茶中逐渐升高;根系活力在大理茶中逐渐下降,在其他3种中均先升后降;而比叶面积则在大厂茶中呈下降趋势,在其他3种中均先升后降。(3)基于生长生理指标的隶属函数抗旱性评价结果表明,MDA含量和细胞质膜透性与野生茶树抗旱性密切相关,4种野生茶树幼苗的抗旱顺序为秃房茶(Camellia gymnogyna Chang)大厂茶(Camellia tachangensis F.C.Zhang)茶(Camellia Sinensis(L.)-O.Kuntze)大理茶(Camellia taliensis(W.W.Smish)),田间持续干旱试验验证了基于隶属函数抗旱性评价方法的准确性和可靠性。
[Abstract]:The seedlings of four wild tea plants, sect TheaThea L.Dyer), in karst area of Guizhou Province, were used to study the physiological growth response to drought stress by pot water control method, and the drought resistance was preliminarily evaluated, and the results were verified by field simulated continuous drought test. The results showed that the relative water content of leaves of four wild tea plants decreased gradually with the increase of drought stress, and the contents of cytoplasmic membrane permeability, malondialdehyde (MDA) and soluble sugar increased. The content of free proline and the activity of superoxide dismutase (SOD) increased first and then decreased. With the increase of drought stress, the total biomass of the four tea species decreased gradually, the root / shoot ratio increased first and then decreased, and the total root length increased first and then decreased, except that in baldness tea, the total root length increased first and then decreased. In the other three species, the total root surface area and root volume decreased gradually in Dali tea and tea, while in Dachang tea and baldness tea, the average root diameter decreased gradually in baldness tea and then decreased in Dachang tea. The root activity in Dali tea decreased gradually, and then decreased in the other three kinds of tea, but the specific leaf area decreased in Dachang tea. The results of drought resistance evaluation based on growth physiological index showed that MDA content and cytoplasmic membrane permeability were closely related to drought resistance of wild tea plants. Camellia tachangensis F.C. Zhang) Camellia Sinensis L.-O. Kuntzee, Camellia taliensis W.W. Smisheng. Field continuous drought test proved the accuracy and reliability of drought resistance evaluation method based on membership function.
【作者单位】： 贵州大学茶学院;贵州大学茶叶工程技术研究中心;贵州省果树工程技术研究中心;贵州省茶叶研究所;
【基金】：国家自然科学基金(31560222) 贵州省科研机构服务企业行动计划项目黔科合服企([2014]4008号) 贵州省教育厅自然科学研究项目((2014)2995号)
【分类号】：S423;S571.1
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本文编号：1927886