Budburst is a key adaptive trait that can help us understand how plants respond to a changing climate from the molecular to landscape scale. Despite this, acquisition of budburst data is constrained by a lack of information at the plant scale on the environmental stimuli associated with the release of bud dormancy. Additionally, to date, little effort has been devoted to phenotyping plants in n...

Previous works on albinism form of Asinara white donkeys (Equus asinus) identified the mutation leading to the peculiar phenotype spread to all specimens of the breed. Inbreeding naturally occurred under geographic isolation, on Asinara Island, in the Mediterranean Sea. Albino individuals can be more susceptible to develop health problems when exposed to natural sun radiation. Alternative metab...

In this issue of the Journal of Biological Rhythms, Zhou et al. (2002) present data from several experiments aimed at identifying effects of photoperiod on the immune systems of two well-established photoperiodic model species: Siberian hamsters (Phodopus sungorus) and Syrian hamsters (Mesocricetus auratus). Their observations are unambiguous: after adaptation to short days, Syrian hamsters exh...

taxus chinensis var. mairei is a rare and endangered medicinal plant species distributed in china. in order to promote fast propagation and preserve the natural resources, conditions for in vitro germination and seedling development of embryos of t. chinensis var. mairei from anhui or zhejiang were investigated. results showed that in vitro germination rate of excised embryos cultured under 14 ...

Larvae of the blow fly, Lucilia sericata (Meigen), enter diapause in the third instar after cessation of feeding. The effects of temperature and photoperiod on the termination of diapause were examined. The diapause terminated spontaneously under the diapause-inducing condition of 20 degrees C and LD 12:12, although pupariation was not synchronous. Diapause development proceeded under a low tem...

background: there is not enough information about theeffects of heat stress and photoperiod on different lobes structure.objectives: the present study aims at determining thehistological changes and the rate of changes in each lobes of ratprostate, affected by photoperiod changes and heat stress.methods:to this end, 15 adult male wistar rats were divided tothree groups: 1. the control group in ...

Adult female mink, living in natural conditions of temperature and photoperiod, were treated by melatonin implants in mid-July, when the summer coat was in its resting stage. As a result, a moult was induced 5 to 6 weeks before the normal time; its showed the characteristics of an autumn moult as observed by the gradient of hair changes over the body and the high number of hair follicles per bu...

The oocyte development (vitellogenesis) of individual fish is highly dependent upon their physiology which influenced by both intrinsic and extrinsic factors. Thus, if individuals encounter poor biophysical conditions, they will likely be unable to reproduce. photoperiod an external factor that constant between years but with increasing intra-annual (seasonal) variation polewards. In high-latit...

Photoperiod or daylength affects a diverse set of traits in plants, including flowering and tuberization in annuals, as well as growth cessation and bud set in perennials. During the last 10-15 years, great progress has been made in the understanding of molecular mechanisms controlling photoperiodic induction of flowering, in particular in the model species Arabidopsis thaliana. An obvious ques...