林业科学 ›› 2021, Vol. 57 ›› Issue (4): 43-53.doi: 10.11707/j.1001-7488.20210405
赵秀婷1,王延双1,段劼1,*,马履一1,2,何宝华3,贾忠奎1,桑子阳4,朱仲龙1,4
收稿日期:
2020-04-06
出版日期:
2021-04-25
发布日期:
2021-05-21
通讯作者:
段劼
基金资助:
Xiuting Zhao1,Yanshuang Wang1,Jie Duan1,*,Lüyi Ma1,2,Baohua He3,Zhongkui Jia1,Ziyang Sang4,Zhonglong Zhu1,4
Received:
2020-04-06
Online:
2021-04-25
Published:
2021-05-21
Contact:
Jie Duan
摘要:
目的: 研究盐胁迫下红花玉兰嫁接苗的生长和光合特性的变化,探究其在盐胁迫下的适应机制,为红花玉兰种质资源的保护和盐渍地区引种、推广提供参考。方法: 以'娇红二号’红花玉兰嫁接苗为材料进行盆栽控制试验,设置5个NaCl浓度梯度,盐胁迫20天后观测其生长状况、叶片性状、气体交换参数、叶绿素荧光参数和光合光响应曲线等。结果: 1)盐胁迫对红花玉兰嫁接苗的苗高、地径、茎生物量和根冠比并无显著影响,对叶生物量、根生物量和整株干质量影响显著,T1叶生物量、根生物量和整株干质量高于CK,其余处理均低于CK。2)随着盐浓度的增大苗木叶片厚度呈先升后降的趋势,T1的叶片厚度最大,达0.30 mm;叶片干质量呈减小趋势;叶面积和比叶面积并无显著差异。3)当盐浓度≥0.2%时,叶绿素a、叶绿素b和总叶绿素含量显著下降;叶绿素a/b随盐浓度增大呈下降趋势,但类胡萝卜素的变化并无显著规律。4)T1的净光合速率(Pn)高于CK,达8.81 μmol·m-2s-1,随着盐浓度增大Pn呈下降趋势;盐处理的气孔导度(Gs)和蒸腾速率(Tr)均小于CK。5)盐胁迫处理的植株叶片叶绿素荧光参数相比对照均有不同程度的下降,其中Fv/Fm、F'v/F'm、ΦPSⅡ和ETR的值均随盐浓度升高而下降,但各盐处理间qP并无显著差异。6)除T1大于CK外,其余处理Pnmax均小于CK;盐胁迫显著降低了叶片暗呼吸速率、光补偿点和光饱和点,且各盐处理间并无显著差异。结论: 盐胁迫显著影响红花玉兰嫁接苗的生长和光合作用,使其叶片细胞光合活性降低,植株生长减缓。综合各指标可知,0.1%盐胁迫下红花玉兰嫁接苗的生长和光合与对照并无显著差异。
中图分类号:
赵秀婷,王延双,段劼,马履一,何宝华,贾忠奎,桑子阳,朱仲龙. 盐胁迫对红花玉兰嫁接苗生长和光合特性的影响[J]. 林业科学, 2021, 57(4): 43-53.
Xiuting Zhao,Yanshuang Wang,Jie Duan,Lüyi Ma,Baohua He,Zhongkui Jia,Ziyang Sang,Zhonglong Zhu. Effects of Salt Stress on Growth and Photosynthetic Characteristics of Magnolia wufengensis Grafted Seedlings[J]. Scientia Silvae Sinicae, 2021, 57(4): 43-53.
表1
盐胁迫对红花玉兰嫁接苗生长的影响①"
处理 Treatment (NaCl) | 苗高相对增长率 Seedling heightrelative growthrate(%) | 地径相对增长率 Ground diameterrelative growthrate(%) | 根生物量 Rootbiomass/g | 茎生物量 Stembiomass/g | 叶生物量 Leafbiomass/g | 干质量 Dry mass/g | 根冠比 Root-shoot ratio |
CK(0) | 2.13±1.06a | 6.00±4.64a | 19.10±2.01ab | 32.20±5.13a | 2.56±0.71ab | 53.87±6.83ab | 0.56±0.07a |
T1(0.1%) | 1.75±0.97a | 5.69±3.45a | 21.48±3.12a | 31.45±6.87a | 3.86±1.09a | 56.79±10.82a | 0.62±0.06a |
T2(0.2%) | 1.63±0.82a | 4.50±4.76a | 14.10±1.00c | 28.37±4.26a | 1.93±0.83b | 44.40±5.82abc | 0.47±0.06a |
T3(0.3%) | 1.62±1.16a | 5.32±4.56a | 14.74±2.19c | 23.71±1.59a | 1.55±1.17b | 40.01±4.79c | 0.58±0.05a |
T4(0.4%) | 1.69±0.57a | 5.49±4.72a | 15.48±1.33bc | 25.03±3.27a | 1.61±0.47b | 42.13±2.10bc | 0.59±0.11a |
表2
盐胁迫对红花玉兰嫁接苗叶片表型性状的影响"
处理 Treatment | 叶片厚度 Blade thickness/mm | 叶面积 Leaf area/cm2 | 叶片干质量 Dry mass of leaf/g | 比叶面积 SLA/(cm2·g-1) |
CK | 0.28±0.04a | 16.94±2.20a | 0.21±0.01a | 82.06±11.58a |
T1 | 0.30±0.07a | 16.97±1.46a | 0.21±0.02a | 82.51±0.77a |
T2 | 0.22±0.08b | 14.68±1.69a | 0.18±0.01ab | 81.74±14.97a |
T3 | 0.18±0.03bc | 14.46±1.93a | 0.18±0.01ab | 79.55±16.10a |
T4 | 0.13±0.02c | 13.69±0.23a | 0.17±0.01b | 79.03±7.41a |
表3
盐胁迫对红花玉兰嫁接苗叶片光合色素含量的影响"
处理 Treatment | 叶绿素 a Chl a/(mg·g-1) | 叶绿素 b Chl b/(mg·g-1) | 叶绿素(a+b) Chl (a+b)/(mg·g-1) | 叶绿素a/b Chl a/Chl b | 类胡萝卜素 Car/(mg·g-1) |
CK | 2.17±0.19a | 0.86±0.07a | 3.02±0.26a | 2.52±0.02a | 0.41±0.03a |
T1 | 2.23±0.29a | 0.90±0.14a | 3.13±0.43a | 2.48±0.06ab | 0.41±0.05a |
T2 | 1.84±0.69a | 0.79±0.29ab | 2.63±0.98ab | 2.33±0.02b | 0.43±0.15a |
T3 | 1.19±0.03b | 0.77±0.10ab | 1.96±0.06bc | 1.55±0.23c | 0.41±0.04a |
T4 | 1.17±0.14b | 0.51±0.06b | 1.68±0.20c | 2.30±0.03b | 0.28±0.08a |
表4
各处理红花玉兰嫁接苗Pn-PAR曲线特征"
处理 Treatment | 最大净光合速率 Pnmax/(μmol·m-2s-1) | 暗呼吸速率 Rd/(μmol·m-2s-1) | 光补偿点 LCP/(μmol·m-2s-1) | 光饱和点 LSP/(μmol·m-2s-1) | 表观量子效率 AQY/(mol·mol-1) |
CK | 10.64±0.77a | 0.44±0.12a | 12.89±0.87a | 335.39±44.24a | 0.035±0.009a |
T1 | 10.74±0.40a | 0.19±0.01b | 3.61±0.62b | 212.99±36.80b | 0.059±0.015a |
T2 | 8.07±0.09b | 0.13±0.03b | 2.41±0.75b | 150.62±16.79b | 0.065±0.007a |
T3 | 6.33±0.18c | 0.17±0.09b | 3.91±1.25b | 165.07±36.47b | 0.043±0.013a |
T4 | 5.72±0.12c | 0.18±0.06b | 4.50±0.63b | 148.69±26.54b | 0.048±0.014a |
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