The effect of cis-propenylphosphonic acid (PPOH), a structural analoge of ethylene, on flower wilting and ethylene production was investigated using cut carnation flowers which are very sensitive to ethylene . Wilting (petal in-rolling) of the flowers was delayed by continuously immersing the stems in a 5-20 mM PPOH solution . In addition, the continuous treatment with PPOH markedly reduced autocatalytic ethylene production of the petals accompanying senescence . This reduction of autocatalytic ethylene production was considered responsible for the inhibitory effect of PPOH on flower wilting . The inhibitory activity of trans-propenylphosphonic acid (trans-PPOH), on both flower wilting and the autocatalytic ethylene production accompanying senescence was markedly lower than that of PPOH, suggesting that PPOH action is stereoselective . PPOH may be of interest as a new, water-soluble inhibitor of wilting and autocatalytic ethylene production in cut carnation flowers .
405
To elucidate effects of climate change on growth and yield of crop plants, we developed a new growth chamber with an air-curtain shed roof. The chamber space was divided into two: one side followed outdoor temperature and the other side was several degrees higher than the outdoor temperature. Furthermore, we tried to assess the real temperature effect by achieving the same vapor pressure deficit (VPD) in two divided spaces and grew rice plants from seedling to maturity stages as an experimental material. For the high temperature (HT) plot, we adopted +4 of the outdoor-temperature-following (control; CONT) plot because, in a preliminary experiment, +5of CONT induced sterility in most grains. The HT conditions advanced the day to flowering of rice, but its grain yield was lower than those obtained under CONT conditions. Trial of the same VPD under HT and CONT conditions suggested that the effect of VPD on rice growth and yield was not large during the June October growth season.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.