茶树不同叶位叶片功能性状与光合特性研究

doi:10.13305/j.cnki.jts.2016.01.010

摘要/Abstract

摘要： 以5个茶树品种（系）为研究对象,分析了茶树新梢不同叶位叶片的叶面积（LA）、叶形指数（LI）、比叶面积（SLA）、干物质含量（LDMC）、叶绿素a（Chla）、叶绿素b（Chlb）、叶绿素总量（Chl）、类胡萝卜素（Car）及光合特性,并研究了叶片功能性状和光合特性之间的相关性。结果表明,不同叶位叶片的LA、LMDC、净光合速率（P_n）、气孔导度（G_s）和蒸腾速率（T_r）由第1叶至第6叶基本呈现先增加后降低趋势,新梢中部3~4叶达到峰值,第1叶和第6叶显著降低（P<0.05）;不同叶位叶片LI和SLA基本呈现随着叶位增加而增加的趋势,第6叶的SLA均显著高于其他叶位（P<0.05）;第1~4叶的Chla、Chlb和Chl含量较高,第6叶Chla、Chlb和Chl含量显著低于其他叶位（P<0.05）,Car变化趋势不明显。LA与LI、LDMC、Chla、Chlb、Chl和Car之间存在显著或极显著正相关,与胞间CO₂浓度（C_i）之间呈显著负相关,与其他指标相关性不显著;LI与其他指标不相关（LA除外）;SLA与LDMC、Chla、Chlb、Chl、Car和P_n之间存在显著或极显著负相关,与C_i之间呈极显著正相关,与其他指标相关性不显著;LDMC与Chla、Chl和P_n之间存在显著或极显著正相关;Chla、Chlb、Chl和Car两两之间均存在极显著正相关,且均与P_n存在显著或极显著正相关;G_s和T_r与叶片功能性状不相关。分析以上结果可以得出,茶树新梢第3~4叶具有相对较大的LA和较强的光合能力,LDMC积累较大,可以作为表征茶树光合能力的供试叶片;SLA、LDMC和光合色素含量与P_n存在密切相关性,可作为评价茶树光合能力的指标。

关键词: 茶树, 不同叶位, 叶片功能性状, 光合特征

Abstract: Taking 5 breeding lines tea as test material, the leaf functional and photosynthetic characteristics of the leaves at different positions were monitored, and correlations between the leaf functional and photosynthetic characteristic analyzed. The leaf functional characteristic included leaf area (LA), the leaf index(LI), specific leaf area (SLA), leaf dry matter content(LDMC), Chla, Chlb, Chl and Car, the photosynthetic indexes included net photosynthetic rate(P_n), stomatal conductance(G_s), intercellular CO₂ concentration(C_i) and transpiration rate(T_r). The results showed that the LA, LMDC, P_n, G_sand T_r firstly increased and then decreased with the leaf position went up, whose maximum value emerged at the middle leaves(from 3rd to 4th). The 1 and 6 leaf measurements were substantially below other leaf position (P<0.05). The LI and SLA increased with the elevation of the leaf position, the maximum values of SLA was at 6th leaf (P<0.05). The Chla, Chlb and Chl of different position leaves (from 1st to 4th) were relatively high, and their amounts in leaves of the 6th leaf were usually lower than other leaf position (P<0.05). The variation trend of Car was not obvious with the leaf position went up. The correlation analysis indicated that the LA was significant and remarkably significant positive correlated with LI, LDMC, Chla, Chlb, Chl and Car, but significant negative with C_i, and not significant correlation with other indicators. LI had no significant correlation with other indicators (except LA). The SLA and LDMC, Chla, Chlb, Chl, Car were significant and remarkably significant negative correlation with P_n, but significant positive correlation with C_i, and not significant correlation with other indicators. The LDMC was significant and remarkably significant positive correlation with L Chla, Chl and P_n. The Chla, Chlb, Chl and Car were positively correlated with each other significantly, and the photosynthetic pigments were remarkably significant positive correlated with Pn. The G_sand T_r showed no significant correlation with other indicators. Our results suggest that: the LA, photosynthetic capacity and LDMC of middle leaves of (from 3rd to 4th) tea plants were relatively higher than those of other leaf positions, so the middle leaves should be the experimental material to test photosynthetic; SLA, LDMC and photosynthetic pigments were closely related with P_n, so they could be used as an index to evaluate the photosynthetic capacity.

Key words: tea plant, different leaves positions, leaf functional, leaf photosynthetic

中图分类号:

王峰, 陈玉真, 王秀萍, 尤志明, 陈常颂. 茶树不同叶位叶片功能性状与光合特性研究[J]. 茶叶科学, 2016, 36(1): 77-84. doi: 10.13305/j.cnki.jts.2016.01.010.

WANG Feng, CHEN Yuzhen, WANG Xiuping, YOU Zhiming, CHEN Changsong. Leaf Functional and Photosynthetic Characteristics in Different Leaves Positions of Tea Plant[J]. Journal of Tea Science, 2016, 36(1): 77-84. doi: 10.13305/j.cnki.jts.2016.01.010.

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