绿斑病藻寄生对夏橙光合日变化的影响

园艺学报 ›› 2006, Vol. 33 ›› Issue (4): 821-824.

绿斑病藻寄生对夏橙光合日变化的影响

王大平^{1, 2};朱钧¹;李道高^1*

(¹ 西南大学园艺园林学院, 重庆400716; ² 重庆文理学院生命科学系, 重庆402168)

收稿日期:2005-12-01 修回日期:2006-02-22 出版日期:2006-08-25 发布日期:2006-08-25

Effect of Green Spot Disease (Apatococcus lobatus) Parasitization on Diurnal Variation of Photosynthesis of Valencia Orange Trees

Wang Daping^{1, 2};Zhu Jun¹;Li Daogao^1*

( ¹College of Horticulture and Landscape, Southwest University, Chongqing 400716, China; ²Department of Life Science, Chongqing University of Arts and Sciences, Chongqing 402168, China)

Received:2005-12-01 Revised:2006-02-22 Online:2006-08-25 Published:2006-08-25

摘要/Abstract

摘要： 以盆栽的2年生‘奥灵达’夏橙为试材, 用LI-6400型便携式光合测定系统研究了绿斑病藻寄生的夏橙叶片光合日变化规律。结果表明: 轻度病叶(严重度为5% ) 净光合速率( Pn) 、气孔导度(Gs) 、蒸腾速率( Tr) 和胞间CO₂ 浓度(Ci) 的日变化与健康叶片相似, Pn和Gs日变化呈双峰型曲线,Tr日变化呈单峰型曲线, Ci在午前直线下降, 午后维持一段时间的较低水平, 而后逐渐回升, 光合作用有明显的“午休”现象, 主要受气孔因素控制; 中度病叶(严重度为40% ) 和重度病叶(严重度为80% )的光合日变化与健康叶片明显不同, Pn、Gs和Tr的日变化曲线整体大幅度下降, 变幅和峰值均小, 而Ci在午前下降缓慢, 午后一直保持较高水平, 光合作用主要受非气孔因素控制。

关键词: 橙, 球藻, 寄生, 光合作用, 日变化

Abstract:

The effect of green spot disease (Apatococcus lobatus) parasitization on diurnal variation of photosynthesis of valencia orange trees ( Citrus ‘Olinda’) was studied by portable photosynthesis system LI-6400 with 2-year pot-grown grafting seedlings. The results showed that diurnal course in net photosynthetic rate (Pn) and stomatal conductance (Gs) of leaveswith low severity (5% ) presented two peaks, transp iration rate ( Tr) appeared single peak, intercellular CO₂ concentration (Ci) before noon greatly declined and
lower Ci was kep t afternoon. Leaves with slight severity were similar to healthy leaves in diurnal variation of photosynthesis, their photosynthesis appeared ‘Wuxiu’phenomenon, and mainly controlled by stomatal factors. Diurnal changes in photosynthesis of leaveswith medium severity (40%) and high severity (80% ) were different greatly from the healthy leaves, their diurnal curve of Pn, Gs, and Tr declined sharp ly, Ci decreased slowly before noon and higher Ciwasmaintained in the whole afternoon, their photosynthesis was mainly controlled by non-stomatal factors.

Key words: Orange, Apatococcus lobatus, Parasitization, Photosynthesis, Diurnal variation

王大平;;朱钧;李道高. 绿斑病藻寄生对夏橙光合日变化的影响[J]. 园艺学报, 2006, 33(4): 821-824.

Wang Daping;;Zhu Jun;Li Daogao. Effect of Green Spot Disease (Apatococcus lobatus) Parasitization on Diurnal Variation of Photosynthesis of Valencia Orange Trees[J]. ACTA HORTICULTURAE SINICA, 2006, 33(4): 821-824.

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