| 曾维军，屈坤杰，万 诚，李 鹏，席培宇，李蕾佳，王济红.干旱胁迫对毛豹皮樟扦插苗光合作用
与叶片组织结构的影响[J].广东农业科学,2021,48(6):7-14 |
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干旱胁迫对毛豹皮樟扦插苗光合作用
与叶片组织结构的影响 |
| Effects of Drought Stress on Photosynthesis and Leaf Tissue Structure of Litsea coreana Levl. var. lanuginosa Cutting Seedlings |
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| DOI：10.16768/j.issn.1004-874X.2021.06.002 |
| 中文关键词: 毛豹皮樟 干旱胁迫 扦插苗 光合作用 叶片组织结构 |
| 英文关键词: Litsea coreana Levl. var. Lanuginosac drought stress cutting seedlings photosynthesis leaf organization |
| 基金项目:中央引导地方科技发展资金项目（［2019］4023 号）；贵州科学院青年基金（［2018］6 号） |
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| 中文摘要: |
| 【目的】了解干旱胁迫对毛豹皮樟扦插苗光合作用与叶片组织结构的影响规律。【方法】以 3 年
生毛豹皮樟扦插苗为试材，设置 4 种不同程度干旱胁迫处理：CK（土壤体积持水量为 39.6%）、轻度（土壤体
积持水量为 29.2%）、中度（土壤体积持水量为 19.5%）、重度（土壤体积持水量为 9.7%），分析毛豹皮樟净
光合速率日变化规律、气体交换参数与环境因子相关性及叶片横切组织结构，研究干旱胁迫对其光合作用与叶
片组织结构的影响。【结果】重度干旱下，毛豹皮樟扦插苗“光合午睡”明显，超过 2 h，光合日变化平均净光
合速率为 1.9712 μmol/m2
·s，光合能力较低，叶表相对湿度与净光合速率相关系数为 -0.462，所以维持叶片正
常光合生理需增加空气水分、降低温度；中度干旱下，毛豹皮樟扦插苗叶片叶绿素总量较高、为 1.25 mg/L，从
而对干旱胁迫作出响应；伴随干旱程度递增，叶片气孔导度降低，中度和重度干旱胁迫下的叶片气孔导度在 0.03
mol/m2
·s 左右，严重影响其水分利用和气体交换，毛豹皮樟扦插苗叶片组织结构也发生变化，上表皮厚度变薄，
栅栏组织变厚，海绵组织变薄。【结论】干旱胁迫能降低毛豹皮樟扦插苗的光合作用，同时也改变叶片组织结构，
干旱胁迫下的光合作用能力与叶片组织结构变化规律 |
| 英文摘要: |
| 【Objective】The study was carried out to understand the effects of drought stress on photosynthesis and
leaf tissue structure of Litsea coreana Levl. var. lanuginosa cutting seedlings.【Method】Three-year-old L. coreana Levl.
var. lanuginosa cutting seedlings were used as experimental materials, and 4 drought stress treatments were set: CK （soil
volume water holding capacity of 39.6%）, mild drought（soil volume water holding capacity of 29.2%）, moderate drought（soil
volume water holding capacity of 19.5%）, and severe drought （soil volume water holding capacity of 9.7%）. The effects
of drought stress on photosynthesis and leaf tissue structure of cutting seedlings of L. coreana Levl. var. lanuginosa were
studied by analyzing the diurnal changes of net photosynthetic rate, the correlation between gas exchange parameters and
environmental factors and the leaf transverse tissue structure.【Result】Under severe drought, the “photosynthetic siesta”of Litsea coreana Levl. var. lanuginosa cutting seedlings was obvious, with over 2 hours. The average net photosynthetic rate of
photosynthesis was 1.9712 μmol/m2
·s, the photosynthetic capacity was low, and the photosynthetic rate correlation coefficient
of relative humidity of leaf surface and net photosynthetic rate was -0.462, therefore, it is necessary to increase the air moisture
and lower the temperature to maintain the normal photosynthetic physiology of the leaves. Under moderate drought, the total
amount of chlorophyll in the cutting seedlings of L. coreana Levl. var. lanuginosa was higher（1.25 mg/L）, which could
respond to drought stress. With the increase of drought degree, leaf stomatal conductance decreased. Leaf stomatal conductance
under moderate and severe drought stress was about 0.03mol/m2
·s, which seriously affected its water use and gas exchange.
The tissue structure of seedling leaves was also changing, the thickness of the upper epidermis became thinner, the palisade
tissue became thicker, and the spongy tissue became thinner.【Conclusion】Drought stress can reduce the photosynthesis
of L. coreana Levl. var. lanuginosa cutting seedlings, and it also changes the leaf tissue structure. The correlation between
photosynthesis capacity and leaf tissue structure changes under drought stress needs to be further studied. |
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