干旱区生态环境知识资源中心(Arid): 水分对番茄不同叶龄叶片光合作用的影响

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	水分对番茄不同叶龄叶片光合作用的影响
其他题名	Effects of water on photosynthesis in different age of tomato leaves
	陈凯利; 李建明; 贺会强; 胡晓辉; 姚勇哲; 孙三杰
来源期刊	生态学报
ISSN	1000-0933
出版年	2013
卷号	33 期号:16 页码:4919-4929
中文摘要	以番茄品种"金棚1号"为材料,采用盆栽方式,按照蒸腾蒸发量(ET)的50%、75%、100%和125%作为补充灌溉量研究了不同水分下番茄结果期叶片气体交换特性和光响应特征参数随叶龄的变化。结果表明:番茄叶片随着叶龄的增加,净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)逐渐降低,水分利用效率(WUE)呈先上升后下降趋势;叶龄为18 d 和29 d的叶片最大净光合速率(P_(max))随灌溉量的增加均先增加后降低,分别在75%ET和100%ET处理达到最大值。叶龄为38 d和47 d的叶片P_(max)均以125%ET处理最大。表观量子效率(alpha)随叶龄的增大也先升高后下降,在叶龄为38 d 时最大;番茄叶片的光饱和点(LSP)随叶龄的加大而减小。不同水分处理下不同叶龄叶片的光响应特征参数为:叶片在叶龄为18 d时,P_(max)为20.64-26.73 mumol·m~(-2)·s~(-1),alpha为0.0518-0.0556;叶龄为29 d时,P_(max)为11.00-24.24 mumol·m~(-2)·s~(-1),alpha为0.0522-0.0594;叶龄为38 d 时,P_(max)为11.77-18.18 mumol·m~(-2)·s~(-1),alpha为0.0619-0.0693;叶龄为47 d时,P_(max)为9.09-18.17 mumol·m~(-2)·s~(-1),alpha为0.0538-0.0606。随叶龄加大,增加补充灌溉量有利于延缓叶片光合能力的降低。气孔限制是水分影响番茄叶片光合作用的主要因素,气孔限制与非气孔限制因素是番茄叶片Pn随叶龄变化的原因。
英文摘要	Water deficit is one of the major rate-limiting factors for plants growing in arid and semiarid region and directly reduce the plant’s photosynthetic rate. Tomato (Lycopersicon esculentum Mill.) is one of the most valuable commercial vegetables all over the world and widely cultivated in China whether in open field or in greenhouse. Light-responsive photosynthetic model provides the reference to evaluate and simulate the plant photosynthesis production and the production capacity of the ecological system. The maximum net photosynthetic rate(P_(max)) and apparent quantum yield(alpha) derived from light response curve are the vital parameters of light-responsive photosynthetic model, which are the critical physiology-ecology parameters of plant photosynthesis characteristics and vary with the plants species, varieties, growth condition and their metabolic status etc.. The leaf age directly affects the efficiency of plants photosynthesis and the values of light-responsive photosynthetic parameters. Water deficit could accelerate leaf senescence and shorten the leaf lifespan. Even the photosynthetic performance of leaves under different water conditions shows the obvious difference at the same leaf age. Up to now there are a few pieces of works reported on light-responsive photosynthetic characteristic of photosynthesis in different age of tomato leaves under multiple supplementary irrigation level. The objective of this study is to profile light-responsive photosynthetic characteristics in tomato with different leaf age of leaves under different levels of supplementary irrigation amount, which will provide the light-responsive photosynthetic parameters for photosynthetic model under different water condition and leaf age. In this study, tomato plants potted in greenhouse as material, the gas exchange and light-responsive photosynthetic characteristics parameters of tomato leaves with the change of leaf age under 4 levels of supplemental irrigation amount (50%ET, 75%ET, 100%ET, and 125%ET) were investigated. The results showed that net photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration rate (Tr) all gradually reduced, but water use efficiency (WUE) ascended firstly and then descended with the increase of tomato leaf age; When leaf age were 18 d and 29 d, both P_(max) increased and then decreased with the increase of supplementary irrigation amount, peaking at 75%ET and 100%ET, respectively. When leaves age were 38 d and 47 d, with the rising of supplementary irrigation amount, both P_(max) ascended, peaking at 125%ET treatment. As for alpha, it rose with leaf aging, reaching a peak at the leaf age of 38 d. And for light saturation point (LSP), it decreased with leaf aging. The light-responsive photosynthetic parameters of different leaf age of tomato leaves under different supplementary irrigation amount were as follows. When leaf age was 18 d, Pmax was 20.64-26.73 mumol·m~(-2)·s~(-1),alpha was 0.0518-0.0556; when leaf age was 29 d, P_(max) was 11.00-24.24 mumol·m~(-2)·s~(-1); alpha was 0.0522-0.0594; when leaf age was 38 d, Pmax was 11.77-18.18 mumol·m~(-2)·s~(-1),alpha was 0.0619-0.0693; when leaf age was 47 d, P_(max) was 9.09-18.17 mumol·m~(-2)·s~(-1),alpha was 0.0538-0.0606. In conclusion, with leaf aging, increasing supplementary irrigation amount could delay the fall of photosynthetic capacity of tomato leaves. Stomatal limiting factor was the main factor of influencing photosynthesis of tomato leaves; Stomatal limiting and non-stomatal limiting factors were the causes of photosynthetic rate varying of tomato leaves according to the leaf age.
中文关键词	番茄 ; 叶龄 ; 水分 ; 光响应特性 ; 气体交换参数
英文关键词	tomato leaf age water light response characteristics gas exchange parameter
语种	中文
国家	中国
收录类别	CSCD
WOS类目	HORTICULTURE
WOS研究方向	Agriculture
CSCD记录号	CSCD:4918921
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/230017
作者单位	西北农林科技大学园艺学院, 杨凌, 712100
推荐引用方式 GB/T 7714	陈凯利,李建明,贺会强,等. 水分对番茄不同叶龄叶片光合作用的影响[J]. 西北农林科技大学,2013,33(16):4919-4929.
APA	陈凯利,李建明,贺会强,胡晓辉,姚勇哲,&孙三杰.(2013).水分对番茄不同叶龄叶片光合作用的影响.生态学报,33(16),4919-4929.
MLA	陈凯利,et al."水分对番茄不同叶龄叶片光合作用的影响".生态学报 33.16(2013):4919-4929.