Short-term fumigation with 1% methanol in air was carried out to investigate effects on the photosynthetic apparatus of horticultural species characterized by leaves with different stomatal distribution. Methanol decreased the photosynthetic capacity of all species. The hypostomatous cherry (Prunus avium L.) was the most sensitive species. Between the two amphistomatous species, the effect was smaller in pepper (Capsicum annuum L. var. annuum) than in melon (Cucumis melo L.). A 4-minute fumigation caused a stronger inhibition of photosynthesis than a 90-second fumigation. The time course of the inhibition of the photosynthetic electron transport following a methanol fumigation of cherry leaves suggests that methanol starts inhibiting photosynthesis and photorespiration after ≈60 seconds and that the effect is complete after 180 seconds. This inhibition is not permanent, however, since gas-exchange properties recovered within 24 hours. Methanol vapor effects were greatest when leaves were fumigated on the surfaces with stomata. However, fumigation with methanol does not affect stomatal conductance. Therefore, inhibition of photosynthesis following methanol fumigation can be attributed to a temporary inhibition of biochemical reactions.
We thank Alexandra Rosati and Jonathan Guan from the NSF Young Scholars Program for carrying out stem water potential measurements and preliminary photosynthesis measurements, respectively. We thank Drs. Loren Oki and Mark Roh for helpful comments
chlorophyll fluorometer and growth chambers and Kassim Al-Khatib for the use of photosynthesis measurement system. Mention of a trademark does not imply endorsement of the product.
photosynthesis by shading, weakening fruit sink strength resulting from lower light and increased temperature and moisture in the bag, or both. However, little supportive experimental evidence has been provided. Photosynthesis occurs in fruit of many crop plants
, so as to maintain the higher photosynthesis level of the scion ( Gao et al., 2016 ). Previous research indicated that changes in environmental factors can alter the physiological processes of thylakoid electron transport, carbon reduction, and CO 2
improve the adaptability and salt tolerance of jujube cultivars. The salt tolerance of wild jujube cultivars currently depends mainly on the use of tolerant rootstocks. Wild jujube often is used as an excellent rootstock for jujube. Photosynthesis is an
mediating this response ( Kinoshita et al., 2001 ; Zeiger et al., 2002 ). Further, increased stomatal density and aperture under high percentages of blue radiation may increase a plant’s capacity for CO 2 uptake, ultimately increasing photosynthesis
the leaf in response to water deficit ( Cifre et al., 2005 ). As plants transition from no or low water deficit to moderate plant water deficit, g S generally declines into the 0.05 to 0.15 mol·m −2 ·s −1 H 2 O range, photosynthesis and
overall reduction in growth but no obvious signs of visible damage ( Wellburn, 1990 ) and mainly affect the physiological metabolism of plants. Chlorophyll (Chl) is the most important plant pigment because it has a crucial role in photosynthesis ( Croft et
( Walworth et al., 2016 ) and, presumably, higher leaf area index. Fig. 2. Net photosynthesis of leaves from immature ‘Wichita’ pecan trees receiving soil applications of Zn-ethylenediaminetetraacetic acid at annual rates of 2.2 kg·ha −1 Zn [Zn1 (gray bars