A biennial sugar beet (Beta vulgaris) generally takes two years to flower and complete its life cycle. In year one, the plant grows vegetatively then enters a cold winter period. two, reproductively initiates flowering under long-day conditions. Among beets that grow in outdoor field conditions, test strains were preliminarily found early 24-h daylength conditions without being exposed temperat...

Abstract Diapause, a period of arrested development that allows mosquitoes to survive inhospitable conditions, is triggered by short daylengths in temperate mosquitoes. Different populations initiate diapause response specific photoperiod, or daylength, resulting population-specific differences annual cycles abundance. The photoperiod causes approximately 50% population known as the critical (C...

Transitory starch is stored during the day inside chloroplasts and broken down at night for export. Maltose is the primary form of carbon export from chloroplasts at night. We investigated the influence of daylength and circadian rhythms on starch degradation and maltose metabolism. Starch breakdown was faster in plants of Arabidopsis (Arabidopsis thaliana) ecotype Wassilewskija growing in long...

Seedlings of Metrosideros were capable of net accumulation of dry matter at photon flux densities as low as 13 /lmol m2 S-I PAR (about 0.6 percent sunlight), when grown under a 12-hour day1ength at 20° or 25°C for over 4 months. Seedlings became adapted to shade at low levels of PAR by an increased leafiness of the plant (expressed as the leaf area ratio). This increased leafiness was brought a...

So what’s the fuss? In mammals, it is the site of an endogenous pacemaker that regulates 24 hour, circadian rhythmicity, synchronizing the phases and periods of a host of behavioral, physiological, and hormonal rhythms to the environmental light–dark cycle. The SCN also appears to function as a seasonal clock underlying the measurement of daylength. The SCN was first implicated as a master cloc...