Search

Copyright of Acta Scientiarum Naturalium Universitatis Sunyatseni / Zhongshan Daxue Xuebao is the property of Sun-Yat-Sen University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Agro-Environment Science is the property of Journal of Agro-Environment Science Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Reproduction defines the fitness of organisms. Surviving and successful adaptation by angiosperms to our changing world depends on their sexual reproduction. Three sexual phenotypes are found in angiosperms at population level, i.e. female flower, male flower and hermaphrodite. The composition and frequency of these three sexual phenotypes in population define the population sexual system. Variation and evolutionary flexibility of key traits associated with sexual systems are also often regarded as major drivers of the divergence of plant lineages and the maintenance of biodiversity, which shape mating chances and mating patterns of male and female gametes in plant populations. Intraspecific sexual system diversity is common in angiosperms, and can be found among flowers or populations. Sexual systems in angiosperms can be divided into two classes, i. e. gender monomorphism and gender polymorphism at population level. Gender monomorphism is an ancient trail, however gender polymorphism has evolved independently in more than 100 angiosperm families. It is believed that sexual systems and sex allocation are highly sensitive to environmental changes and the ways that sexual expression responds to changes in abiotic and biotic environment is a major current them in evolutionary biology and ecology. There we discuss within-population polymorphisms in sexual systems and review the frequencies of different sexual systems in angiosperms from the perspective . of how sexual expression and sex allocation respond to generic constrains, abiotic environments and mating environmental, aiming to encourage more studies in this area. [ABSTRACT FROM AUTHOR]

Copyright of Forest Research is the property of Forest Research Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The AP2 transcription factor subfamily widely exists in plants, and plays a very important role in regulating plant development. The previous studies showed that SUPERNUMERARY BRACT (OsSNB) was a member of AP2 transcription factor subfamily containing 2 conservative AP2 domains. And OsSNB was involved in regulating the transition from spikelet meristem to floral meristem and the development of floral organ. However, it is not clear whether OsSNB is involved in abiotic stress responses. In this study, OsSNB gene was obtained from the RAP-DB rice database. In order to investigate the role of OsSNB in abiotic stress and hormone response, sequence analysis revealed that OsSNB promoter contained multiple hormone and stress responsive cis-acting elements, including GCC-box, ABRE, DRE and WRKY. Gene express analysis showed that OsSNB gene could be duressed by abiotic stress salt, drought and induced by hormones ABA and ethylene precursor ACC. These results suggested that OsSNB gene might be involved in regulating the expression of genes responsive to stresses, implying that OsSNB might have important functions in plant growth, development, and abiotic stress responses. [ABSTRACT FROM AUTHOR]