Abstract
The relationship between fluorescence kinetics and allelopathic expression of four winter-wheat ecotypes in heading period was discussed. With the breeding history from No. 1 Bima, No. 3 Fengchan, No. 1 Ningdong to No 22 Xiaoyan and agronomic properties of winter wheat like thousand seed weight and yield, etc increased gradually. Meanwhile, allelopathic potential was also enhanced. It was explained well by physiological basis of fluorescence kinetics. Fm' and F was induced to increase, furthermore, photosynthesis system PSII would be expressed superiorly under arid press. Significant relationship among growth traits, florescence kinetics and allelopathic potential was discovered. Three kinds of parameters like yield, chlorophyll and allelopathic potential of winter wheat in heading period formed a complex network system. So, allelopathy variation was mainly determined and regulated by the presumed net system in plants. It is important in screening and breeding of allelopathic crops cultivars, including development of sustainable agriculture. Key words: Allelopathy trait, fluorescence kinetics, Triticum aestivum L., dryland farming, network system.
Highlights
Chlorophyll fluorescence from the plant adhered closely to response process in photosynthesis effect
Allelopathic potential of four wheat ecotypes with different genetic background In germination and seedling stages, wheat was apt to produce and exude allelochemicals like hydroxylamine and phenolic acids, which lead to allelopathic effect and further suppress weed growth such as annual ryegrass, etc (Huang et al, 2000)
Roots showed different allelopathy order comparing with aerial parts to non-transgenic potato, whose increased with was in root number, maximal leaf area, leaf number per plant, total fresh weight of seedling, branches per plant, main stem
Summary
Chlorophyll fluorescence from the plant adhered closely to response process in photosynthesis effect. Photosynthesis efficiency in crops from dryland farming ecosystem was determined mainly by both interior genetic factors and exterior environmental circumstance, for example, field water and fertilizer condition. Vernalization, photoperiod and precocious property, as three important characteristics influencing wheat growth and development in heading period, would regulate growth stages to deal with different environmental press by their function and interaction (Sourdille et al, 2000). In heading stage of wheat the differentiation of young tassel determined the establishment of wheat ears and seeds per tassel, which was affected by genotype feature and living environment like terrain, soil water and climate etc. The time of heading period of wheat would determine grouting efficiency and affect seeds weight. It was necessary to conduct physiological ecology of wheat in heading period so as to naturally screen useful genetic variation adapting widely and culture reasonable genotype complying with the nature
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