Morpho-anatomical and photosynthetic responses of Taxodium hybrid 'Zhongshanshan' 406 to prolonged flooding
Morpho-anatomical and photosynthetic responses of Taxodium hybrid 'Zhongshanshan' 406 to prolonged flooding
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DOI：
10.1016/j.flora.2017.04.007
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发表时间：
2017-06-01
期刊：
影响因子：
1.9
通讯作者：
Yin, Yunlong
中科院分区：
文献类型：
--
作者：
Hua, Jianfeng;Han, Luwan;Yin, Yunlong
红豆杉杂交种'中山山406'（T. mucronatum Tenore female x T.双列菊（L.）丰富的男性;红豆杉406）已被选定为一个物种，在中国的洪水地区重建。为了阐明红豆杉406对长期淹水环境的适应策略，研究了红豆杉406在半淹水（HF）和全淹水（TS）胁迫下的形态解剖、光合和生长反应。在两种淹水处理下，红豆杉406的成活率均为100%。与对照相比，HF处理根系生物量和根冠比降低，株高和地上部生物量分别增加40%和58%，总生物量基本不变。TS植株的根生物量、总生物量和根冠比分别比CK植株低69%、48%和58%。然而，与初始值相比，观察到TS植物的非伸长高度和增加的基部直径。此外，在试验结束时，TS植株的叶绿素含量高于其他两个处理。HF淹水处理使红豆杉406植株形成发达的通气组织、肥大的细胞器、大的细胞间隙和不定根。此外，HF和TS植株的根系形态参数（总长度、表面积、体积、根尖和直径长度）均低于CK植株，且HF和TS植株间差异不显著。与对照相比，HF处理的净光合速率没有变化，而气孔导度、蒸腾速率和胞间CO2浓度均有所增加。因此，HF植物的形态解剖适应和光合作用的维持以及TS植物的生长迟缓是导致落羽杉406植物在极端洪涝环境下生存和生长的原因。(C)2017 Elsevier GmbH. All rights reserved.
Taxodium hybrid 'Zhongshanshan 406' (T. mucronatum Tenore female x T. distichum (L.) Rich male; Taxodium 406) has been selected as a species for reforestation in flooding areas, China. To elucidate its adaptive strategies to prolonged flooding environments, morpho-anatomical, photosynthetic and growth responses of Taxodium 406 were investigated during three months of flooding stress, i.e. half-flooding (HF) and total submergence (TS). Taxodium 406 showed 100% survival rate under both flooding treatments. Compared to control (CK), root biomass and root/shoot ratio of HF plants were reduced, while height and shoot biomass were increased by 40% and 58% respectively, and thus total biomass was unchanged. For TS plants, their root biomass, total biomass and root/shoot ratio were 69, 48 and 58% lower respectively, than those of CK plants. Compared to initial values, however, non-elongating height and increased basal diameter of TS plants were observed. Besides, TS plants had greater chlorophyll contents than the other two treatments at the end of the experiment. Well-developed aerenchyma, hypertrophied lenticels, large intercellular spaces and adventitious roots of Taxodium 406 plants were formed under HF flooding treatment. Additionally, tested root morphological parameters, i.e. total length, surface area, volume, tips and length in diameter of four classes were lower for HF and TS plants than for CK plants, and no significant difference was found between HF and TS plants. Compared to CK plants, net photosynthetic rate of HF plants was unchanged, while stomatal conductance, transpiration rate and intercellular carbon dioxide concentration were enhanced across the experiment. Therefore, morpho-anatomical adaption and maintenance of photosynthesis of HF plants and the growth retardation of TS plants are responsible for the survival and growth of Taxodium 406 plants under extreme flooding environments. (C) 2017 Elsevier GmbH. All rights reserved.