PJB-2009-127
CHANGES IN ABSCISIC ACID IMMUNOLOCALIZATION IN HEAT-STRESSED PEPPER SEEDLINGS
LIU TONG-XIANG1, ZHANG ZONG-SHEN2*, WAMG JIAN-BO3 AND LI RONG-QIAN3
Abstract
The heat stress-responsive abscisic acid (ABA) subcellular distribution in pepper mesophyll and root cap cells was investigated by colloidal gold labeling technique. The results showed that the ABA was localized in the nucleus and the cytoplasm of two cell types in the seedlings under normal temperature, with relatively a higher accumulation in the root cap cells. As the seedlings were transferred to 40oC for heat stress, the ABA levels in both mesophyll and root cap cells increased markedly, especially in the later. With a sustained heat stress, the ultrastructure of mesophyll cell was severely damaged and more ABA accumulated in the nucleus of mesophyll cells; comparably, the root cap cell maintained intact ultrastructurally, and a concomitant drastic increase in ABA in the nucleus of root cap cells was also observed. The above results imply that ABA might be one of the heat stress signaling members in plant cells, whereas the mechanism by which ABA functions during this process remains poorly understood.
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