Abstract
Morphogenesis of Dollard red clover clones has provided indirect evidence that endogenous auxin level and, or, sensitivity of response of tissues to auxin vary according to light and temperature and as a function of genotype.The amount of growth and development was less in autotetraploid than in diploid plants.Root formation on propagules was influenced by relatively short-term different daylength pretreatments of intact plants; also, by the daylength and light intensity imposed during rooting.Under reduced light intensity extension growth already initiated was increased and this was related to increased "sensitivity" of growth response of stems and petioles to applied auxin.Morphogenetic effects relatively similar to those caused, respectively, by shortening the daylength and by lengthening the daylength resulted from antiauxin (TIBA) as compared with auxin (IAA) treatments.Concentrations of IAA that were primarily stimulatory to growth under shorter daylengths were inhibitory under continuous light. The primary stimulatory effect of IAA was on bud formation under SD but on stem elongation under LD.The relatively similar and additive effects of photoperiod, applied auxin, and cold pretreatment are discussed. It is postulated that in red clover a greater endogenous diffusible auxin level is required for optimum formation of stems and inflorescences than for buds and roots.Manipulation of light and temperature and the use of growth regulators provide added precision in the control of growth and development in red clover.
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