FROM SEED-TO-SEED EXPERIMENT WITH WHEAT PLANTS UNDER SPACE-FLIGHT CONDITIONS

被引:35
|
作者
MASHINSKY, A [1 ]
IVANOVA, I [1 ]
DERENDYAEVA, T [1 ]
NECHITAILO, G [1 ]
SALISBURY, F [1 ]
机构
[1] UTAH STATE UNIV,DEPT PLANTS SOILS & BIOMETEOROL,LOGAN,UT 84322
关键词
D O I
10.1016/0273-1177(94)90274-7
中图分类号
V [航空、航天];
学科分类号
08 ; 0825 ;
摘要
An important goal with plant experiments in microgravity is to achieve a complete life cycle, the ''seed-to-seed experiment.'' Some Soviet attempts to reach this goal are described, notably an experiment with the tiny mustard, Arabidopsis thaliana, in the Phyton 3 device on Salyut 7. Normal seeds were produced although yields were reduced and development was delayed. Several other experiments have shown abnormalities in plants grown in space. In recent work, plants of wheat (Triticum aestivum) were studied on the ground and then in a preliminary experiment in space. Biometric indices of vegetative space plants were 2 to 2.5 times lower than those of controls, levels of chlorophyll a and b were reduced (no change in the ratio of the two pigments), carotenoids were reduced, there was a serious imbalance in major minerals, and membrane lipids were reduced (no obvious change in lipid patterns). Following the preliminary studies, an attempt was made with the Svetoblock-M growth unit to grow a super-dwarf wheat cultivar through a life cycle. The experiment lasted 167 d on Mir. Growth halted from about day 40 to day 100, when new shoots appeared. Three heads had appeared in the boot (surrounded by leaves) when plants were returned to earth. One head was sterile, but 28 seeds matured on earth, and most of these have since produced normal plants and seeds. In principle, a seed-to-seed experiment with wheat should be successful in microgravity.
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页码:13 / 19
页数:7
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