Effect of Shading on Growth and Photosynthetic Characteristics of Cotoneaster hjelmqvistii(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:

2014年07期

Page:

52-56

Research Field:

Publishing date:

Info

Title:

Effect of Shading on Growth and Photosynthetic Characteristics of Cotoneaster hjelmqvistii

Author(s):

LIU Fang¹; LI Yi-ran²; LIU Yi²; JIA Ai-jun³; ZHANG Ting²; LUO Jian-xia²

1.Tianjin Cuiping Lake Science Park,Tianjin 301908；

2.Department of Horticulture,Tianjin Agricultural College,Tianjin 300381；

3.Tianjin Research Institute of Forestry and Pomology,Tianjin 300381

Keywords:

Cotoneaster hjelmqvistii; shading treatment; leaf area; photosynthetic characteristics; chlorophyll content

PACS:

S 615

DOI:

-

Abstract:

Using one-year-old tissue cultured plants of Cotoneaster hjelmqvistii as test material,effect of shading treatment on leaf area,chlorophyll content,photosynthetic-rate and intercellular CO₂ concentration were studied to understand the shade-tolerance of C.hjelmqvistii.The results showed that the leaf area covered with shade net was very significantly larger than that under full sunlight condition and trended to increase significantly with the increase of shading degree and presented the largest leaf area under three layers of shade nets (8% of light transmission rate).The leaf thickness under full sunlight conditions was very significantly thicker than that covered with two (17% of light transmission rate) and three layers of shade nets,but had no significantly difference with that covered with one layer of shade net (46% of light transmission rate).Chlorophyll content under shading conditions was significantly higher than that in full sunlight condition in which ratio of chlorophyll a/b was significantly higher than that covered with one layer of shade net and was very significantly higher than that with two layers of shade nets or with three layer covers.Photosynthetic rate under full sunlight condition was significantly higher than that with shading conditions.Under the shade conditions,photosynthetic rate and stomatal conductance was significantly reduced while intercellular CO₂ concentration increased significantly with increasing degree of shading.Taking the tested indicators and field observation into account, C.hjelmqvistii could be considered as a heliophile,and had shade-tolerance in a certain degree and could grow normaly in 22.864 klx of light intensity and 46% of light transmission rate.

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