Camptotheca acuminata check for this species in other resources ; camptothecin; 10-hydroxycamptothecin; response; heat shock"/>
 
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Acta Botanica Sinica
Botanical Society of China and Institute of Botany, the Chinese Academy of Sciences
ISSN: 0577-7496
Vol. 45, No. 7, 2003, pp. 809-814
Bioline Code: as03009
Full paper language: English
Document type: Research Article
Document available free of charge

Acta Botanica Sinica, Vol. 45, No. 7, 2003, pp. 809-814

 en Different Responses of Camptothecin and 10-Hydroxycamptothecin to Heat Shock in Camptotheca acuminata check for this species in other resources Seedlings
ZU Yuan-Gang, TANG Zhong-Hua, YU Jing-Hua, LIU Shi-Gang, WANG Wei, GUO Xiao-Rui

Abstract

Plants interact with their environment by producing a diverse array of secondary metabolites, one of which is alkaloid. In this study, alkaloids, including camptothecin (CPT) and 10-hydroxycamptothecin (HCPT), malondialdehyde (MDA) and chlorophyll contents were measured during heat shock in seedlings of Camptotheca acuminata check for this species in other resources Decaisne unique to China. Responses of different tissues, including young leaves, old leaves, buds and barks, to heat shock were examined in alkaloid changes. CPT and HCPT concentrations reached their peak values separately at 38 °C and 40 °C, which were below the lethal heat-shock temperature indicated by MDA and chlorophyll, and their great changes took place in young leaves. These results indicated that CPT and HCPT were involved in the C. acuminata resistance against heat shock from its environment. Furthermore, plant rigidly observed the cost-benefit principle and mobilized and allocated limited alkaloid sources to young and reproductive tissues preferentially. In addition, HCPT displayed well-regulated changes during incubation at sublethal temperature, and this indicated that HCPT might play a more positively defensive role in enhancement of plant thermotolerance than CPT does.

Keywords
Camptotheca acuminata check for this species in other resources ; camptothecin; 10-hydroxycamptothecin; response; heat shock

 
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