排序方式: 共有84条查询结果,搜索用时 15 毫秒
81.
Hybridization is common and important to the adaptive evolution of plants. Hybridization has resulted in the formation of
new species and the introgression of traits between species. This paper discusses the advantages of using hybrid systems to
explore the evolution of tolerance to herbivore damage (i.e., the ability to diminish the negative effects of damage on fitness).
The major consequence of hybridization likely to make it influential for tolerance evolution is that hybridization generates
broad variation in traits that can be selected for or against. In addition to generating greater variation in tolerance to
damage and its putative traits (e.g., traits associated with allocation patterns and meristem production), hybridization can
generate greater independence among tolerance traits and between tolerance and defense traits. Greater independence may provide
a greater ability to discern mechanisms of tolerance, give a greater probability of detecting allocation costs of tolerance,
and provide an effective means to evaluate tradeoffs between tolerance and defense. Interspecific hybrid systems can also
be used to evaluate the importance of co-adaptation of tolerance traits. Moreover, recombinant hybrids can be used in selection
studies focusing on tolerance to damage to discern whether parental combinations of tolerance traits are favored over novel
combinations. Research in hybrid systems that investigate the selective importance of tolerance, the patterns of inheritance
of tolerance traits, and the genetic architecture of plant species involved can be vital to our evaluation of the adaptive
role of tolerance to damage.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
82.
Colin M. Orians Bernadette M. Roche Robert S. Fritz 《Biochemical Systematics and Ecology》1996,24(7-8):719-724
Willows and many other members of the Salicaceae often produce phenolic glycosides, and the concentrations of these are known to vary among plants. We used progeny from a factorial half-sib quantitative genetics experiment with Salix sericea to determine whether the concentration of two phenolic glycosides, salicortin and 2′-cinnamoylsalicortin, show additive heritability. We found that the concentration of salicortin was much higher than 2′-cinnamoylsalicortin, and that both compounds showed additive genetic variation. However, the heritability of these two chemicals differed dramatically. We obtained heritability values of 0.20 for salicortin and 0.59 for 2′-cinnamoylsalicortin. Plant growth parameters were not strongly correlated with the concentrations of these phenolic glycosides. 相似文献
83.
84.