盐胁迫对平欧杂种榛幼苗生长、光合荧光特性及根系构型的影响

doi:10.13287/j.1001-9332.201910.001

应用生态学报 ›› 2019, Vol. 30 ›› Issue (10): 3376-3384.doi: 10.13287/j.1001-9332.201910.001

盐胁迫对平欧杂种榛幼苗生长、光合荧光特性及根系构型的影响

罗达¹, 史彦江¹, 宋锋惠^1*, 李嘉诚²

¹新疆林业科学院经济林研究所, 乌鲁木齐 830063;
²新疆农业大学林学与园艺学院, 乌鲁木齐 830052

收稿日期:2019-05-21 出版日期:2019-10-20 发布日期:2019-10-20
通讯作者: *E-mail: sfh1111@126.com
作者简介:罗达, 男, 1984年生, 博士, 助理研究员. 主要从事经济林生理生态学研究. E-mail: luoda2010@163.com
基金资助:
新疆公益性科研院所基本科研业务费专项(ky2018050)、新疆“天池博士计划”和新疆重点研发计划项目(2016B01005-2)资助

Effects of salt stress on growth, photosynthetic and fluorescence characteristics, and root architecture of Corylus heterophylla ×C. avellan seedlings

LUO Da¹, SHI Yan-jiang¹, SONG Feng-hui^1*, LI Jia-cheng²

¹Institute of Economic Forestry, Xinjiang Academy of Forestry Science, Urumqi 830063, China;
²College of Forestry and Horticulture, Xinjiang Agricultural University, Urumqi 830052, China

Received:2019-05-21 Online:2019-10-20 Published:2019-10-20
Contact: *E-mail: sfh1111@126.com
Supported by:
This work was supported by the Xinjiang Nonprofit Institute Research Grant (ky2018050), the Xinjiang ‘Tianchi Doctoral Project’ and the Xinjiang Key R&D Program (2016B01005-2).

摘要/Abstract

摘要： 以平欧杂种榛3个品种(新榛1号、新榛2号、新榛3号)幼苗为材料,研究不同盐胁迫程度(对照、轻度、中度、重度)对幼苗生长性状、光合荧光特性以及根系构型的影响.结果表明: 3个品种幼苗的新稍长度、基径、叶面积,以及根、茎、叶、总生物量随着盐胁迫的增强而降低,根冠比则增加.中度、重度盐胁迫下3个品种幼苗的净光合速率较对照分别显著降低20.5%和43.2%.轻度、中度、重度盐胁迫下的蒸腾速率和气孔导度较对照分别降低2.0%、16.3%、32.0%和10.2%、35.7%、60.1%.随着盐胁迫的增强,胞间CO₂浓度缓慢上升,水分利用效率呈先上升后下降的趋势,并在轻度盐胁迫下达到最大值.3个品种幼苗的初始荧光随着盐胁迫的增强而升高.最大荧光、最大光化学效率、潜在光化学活性、实际光化学效率、电子传递速率、光化学淬灭系数随着盐胁迫的增强而下降,非光化学淬灭系数则随着盐胁迫的增强先升高后降低.根系构型分析表明,盐胁迫导致3个品种幼苗的根系生物量、长度、表面积和体积下降.同一盐胁迫下,新榛2号各径级根系构型参数的下降幅度低于其他2个品种.平欧杂种榛幼苗生长性状、光合荧光特性以及根系构型参数受品种和盐胁迫程度的双重影响.盐胁迫下新榛2号表现出较强的生长与光合生理适应性,其耐盐性优于其他2个品种.

Abstract: We examined the effects of different salt stress intensities (control, mild, moderate, severe) on the growth traits, photosynthetic and fluorescence characteristics, and root architecture of three Corylus heterophylla × C. avellan varieties (Xinzhen 1, Xinzhen 2, Xinzhen 3). The results showed that the new shoot length, basal diameter, leaf area, root biomass, shoot biomass, leaf biomass, and total biomass of the three varieties all decreased, but the root-shoot ratio increased with increasing salt stress. The net photosynthetic rate of the three varieties in the moderate and severe salt stress treatments significantly decreased by 20.5% and 43.2%, respectively. The transpiration rate and stomatal conductance in the mild, moderate, and severe salt stress treatments decreased by 2.0%, 16.3%, 32.0% and 10.2%, 35.7%, 60.1% than those of the control, respectively. With the increasing salt stress, the intercellular CO₂ concentration gradually increased, while the water use efficiency increased first and then decreased and being the highest in the mild salt stress treatment. The initial fluorescence of the three varieties increased with the increasing salt stress. With the increasing salt stress, the maximum fluorescence, maximal photochemical efficiency, potential photochemical activity, actual photochemical efficiency, electron transfer rate and photochemical quenching coefficient decreased, while the non-photochemical quenching coefficient increased first and then decreased. Salt stress reduced root biomass, length, surface area and volume of the three varieties. In the same salt stress treatment, the reduction of root architecture parameters of Xinzhen 2 was lower than the other two varieties. The growth traits, photosynthetic and fluorescence characteristics, and root architecture parameters of Corylus heterophylla × C. avellan were affected by both varieties and salt stress. Xinzhen 2 displayed stronger growth and photosynthetic physiological adaptability to salt stress, showing stronger salt tolerance than the other two varieties.

罗达, 史彦江, 宋锋惠, 李嘉诚. 盐胁迫对平欧杂种榛幼苗生长、光合荧光特性及根系构型的影响[J]. 应用生态学报, 2019, 30(10): 3376-3384.

LUO Da, SHI Yan-jiang, SONG Feng-hui, LI Jia-cheng. Effects of salt stress on growth, photosynthetic and fluorescence characteristics, and root architecture of Corylus heterophylla ×C. avellan seedlings[J]. Chinese Journal of Applied Ecology, 2019, 30(10): 3376-3384.

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盐胁迫对平欧杂种榛幼苗生长、光合荧光特性及根系构型的影响

Effects of salt stress on growth, photosynthetic and fluorescence characteristics, and root architecture of Corylus heterophylla ×C. avellan seedlings

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