Relationship Between Carbohydrate Allocation and Photosynthesis DuringFlorescence and Flower Senescence Period in Tree Peony

ACTA HORTICULTURAE SINICA ›› 2007, Vol. 34 ›› Issue (1): 153-156.

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Relationship Between Carbohydrate Allocation and Photosynthesis DuringFlorescence and Flower Senescence Period in Tree Peony

FENG Ya-nan¹ ;ZHENG Guo-sheng^1,2 ; WANG Zong-zheng¹ ; GAO Hui-yuan^1*

(¹ Life Sciences College, Shandong Agricultural University, Taipan, Shandong 271018, China; ² Laiyang Agricultural College,Qingdao, Shandong 266109, China )

Received:1900-01-01 Revised:1900-01-01 Online:2007-02-25 Published:2007-02-25

Abstract

Abstract: Gas exchange, chlorophyll fluorescence and bio2analysis were used to study the influence of
carbohydrate allocation on net photosynthetic rate in leaves of tree peony ( Paeonia suffruticosa ‘Rou Furong’)
brancheswith and without flower. The results showed that before flower senescence, the net photosynthetic
rate in leaves on brancheswith flower ( FL) was lower than that in leaves on brancheswithout flower (NFL).
Whereas the total soluble sugar content was higher in the FL than that in the NFL. Compared with that at
17∶00 on the p revious day, after a night consump tion, the total soluble sugar content in the NFL decreased
obviously at 8 ∶00 a1m. while that in the FL hardly changed. These results indicate that there were other
sources to supp ly soluble sugar in FL besides photosynthesis during the florescence period. After flower senes
cence, differences in net photosynthetic rate and total soluble sugar content between the NFL and the FL dis
appeared gradually, and the total soluble sugar content in both the FL and the NFL was lower at 8: 00 a. m.
than that at 17∶00 on the p revious day, which suggest that the other sourcesmentioned above did notwork to
supp ly carbohydrates to the leaves any more. It is speculated that thismetabolic pathway might be correlated
with flower growth.

Key words: Tree peony, Anthesis, Carbohydrate, Photosynthetic rate

FENG Ya-nan;ZHENG Guo-sheng;;WANG Zong-zheng;GAO Hui-yuan. Relationship Between Carbohydrate Allocation and Photosynthesis DuringFlorescence and Flower Senescence Period in Tree Peony[J]. ACTA HORTICULTURAE SINICA, 2007, 34(1): 153-156.

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Relationship Between Carbohydrate Allocation and Photosynthesis DuringFlorescence and Flower Senescence Period in Tree Peony

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