GROWTH, HISTOGENESIS AND MORPHOGENESIS IN RAPHANUS-SATIVUS L UNDER WATER-STRESS - THE SEEDLING

被引：0
作者：
MELATI, MR
SCIALABBA, A
机构：
[1] Département de Botanique, Université de Palermo, Via Archiraji
来源：
BULLETIN DE LA SOCIETE BOTANIQUE DE FRANCE-LETTRES BOTANIQUES | 1990年 / 137卷 / 4-5期
关键词：
WATER STRESS; MANNITOL; GROWTH; SEEDLING; XYLOGENESIS; RAPHANUS-SATIVUS L; RADISH;
D O I：
10.1080/01811797.1990.10824888
中图分类号：
Q94 [植物学];
学科分类号：
071001 ;
摘要：
Radish etiolated seedlings were subjected to water stress using mannitol as osmoticum. As the mannitol concentration increased, measurements were made on growth, relative water content (RWC) and xylem elements. The xylem pattern was also observed. The presence of mannitol in the culture medium strongly modifies the fresth weight, water content and the length of radish seedlings and their hypocotyl and root morphogenesis, while dry weight was not significantly affected. At concentrations above 4% mannitol, growth was greatly reduced after 48 and 72 hours of incubation. Xylogenesis and wall deposition patterns were altered at severe water stress. Growth was more sensitive than cell wall synthesis to stress. Based on the water stress experiments it is concluded that the differences in plant water status caused differences in elongation, expansion of xylem elements, cell division and xylogenesis. The sensitivity of response to changes caused by water stress indicates the direct role of water in growth, morphogenesis and xylogenesis.
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页码：271 / 277
页数：7
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