CHANGES IN SYNTHESIS AND LOCALIZATION OF MEMBERS OF THE 70-KDA CLASS OF HEAT-SHOCK PROTEINS ACCOMPANY THE INDUCTION OF EMBRYOGENESIS IN BRASSICA-NAPUS L MICROSPORES

被引:65
作者
CORDEWENER, JHG
HAUSE, G
GORGEN, E
BUSINK, R
HAUSE, B
DONS, HJM
VANLAMMEREN, AAM
CAMPAGNE, MMV
PECHAN, P
机构
[1] WAGENINGEN UNIV AGR, DEPT PLANT CYTOL & MORPHOL, 6703 BD WAGENINGEN, NETHERLANDS
[2] MAX PLANCK INST BIOCHEM, W-8033 MARTINSRIED, GERMANY
关键词
BRASSICA; EMBRYOGENESIS; HEAT SHOCK; MICROSPORE; POLLEN; RAPESEED;
D O I
10.1007/BF01106770
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Elevation of the culture temperature to 32 degrees C for approximately 8 h can irreversibly change the developmental fate of isolated Brassica napus microspores from pollen development to embryogenesis. This stress treatment was accompanied by de-novo synthesis of a number of heat-shock proteins (HSPs) of the 70-kDa class: HSP68 and HSP70. A detailed biochemical and cytological analysis was performed of the HSP68 and HSP70 isoforms. Eight HSP68 isoforms, one of which was induced three fold by the stress treatment, were detected on two-dimensional immunoblots. Immunocytochemistry revealed a co-distribution of HSP68 with DNA-containing organelles, presumably mitochondria. Six HSP70 isoforms were detected, one of which was induced six fold under embryogenic culture conditions. During normal pollen development, HSP70 was localized in the nucleoplasm during the S phase of the cell cycle, and predominantly in the cytoplasm during the remainder. Induction of embryogenic development in late unicellular microspores was accompanied by an intense anti-HSP70 labeling of the nucleoplasm during an elongated S phase. In early bicellular pollen the nucleus of the vegetative cell, which normally does not divide and never expresses HSP70, showed intense labeling of the nucleoplasm with anti-HSP70 after 8 h of culture under embryogenic conditions. These results demonstrate a strong correlation between the phase of the cell cycle, the nuclear localization of HSP70 and the induction of embryogenesis. As temperature stress alone is responsible for the induction of embryogenic development, and causes an altered pattern of cell division, there might be a direct involvement of HSP70 in this process.
引用
收藏
页码:747 / 755
页数:9
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