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Photosynthetic Characteristics of Syringa Under Different Sunlights(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2014年19期
Page:
68-72
Research Field:
Publishing date:

Info

Title:
Photosynthetic Characteristics of Syringa Under Different Sunlights
Author(s):
ZHU Ying 1; 2; CHEN Jin-yong 1; 2
1.Beijing Botanical Garden,Beijing 100093；
2.Beijing Floriculture Engineering Technology Research Centre,Beijing 100093
Keywords:
Syringa; net photosynthetic rate; light reaction curve
PACS:
S 685.99
DOI:
-
Abstract:
Taking Syringa plants as test materials,using the portable photosynthesis system,the effects of different light on photosynthetic characteristics were studied,6 kinds of light response curve were determined.The results showed that the net photosynthetic rate (Pn) showed double peaks curve under full sunlight,and the average Pn was 20 times higher than that under shading .The light use efficiency (LUE) and water use efficiency (WUE) were peaked at 6:00 and 16:00 under full light,whereas they were peaked between 10:00 and 14:00 under shading and peak was appeared at 10:00.The daily transpiration rate was correlated with Pn.The stomatal conductance under full light was higher than that under shading.Meanwhile,the light reaction curve of 6 species of Syringa was studied.The results showed that light compensation point was 52~90 μmol.m-2.s-1 and light saturation point was 800~1 400 μmol.m-2.s-1,indicatingSyringa was a sun plant.The photosynthetic rate was the highest in Syringa×chinensis,with maximum Pn 20 μmol.m-2.s-1,the lowest in Syringa pubescens subsp.microphylla with maximum Pn of 8 μmol.m-2.s-1,while others of 13 μmol.m-2.s-1.

References:

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Last Update: 2014-11-25