Plants under climatic stress. III. Low temperature, high light effects on photosynthetic products

Journal Article · Sat Jan 01 04:00:00 EST 1972 · Plant Physiol.; (United States)

DOI:https://doi.org/10.1104/pp.49.5.798· OSTI ID:5721188

Taylor, A O; Jepsen, N M; Christeller, J T

An investigation has been made of the combined effects of low temperature and high light on the level of several photosynthetic products in the leaves of a group of plants differing widely in their tolerance to this stress. Starch levels in these plants after chilling are dependent on the time of day that temperatures are lowered and seem related to rates of CO/sub 2/ assimilation under this stress. Prolonged low-temperature, high-light treatment (10 C at 160 wm/sup -2/) of Sorghum bicolor induced a rapid starch hydrolysis after a lag of some 24 hours. Differing rates of starch loss at the cellular level and a rapid migration of chloroplasts toward the base of upper mesophyll cells were also seen in leaves of this stress-sensitive species. Chilling increased the level of almost all free amino acids in tolerant and in semi-tolerant species, while amino acids related to intermediates of the C-pathway show a sharp or transitory decrease in Sorghum. These and other changes observed in Sorghum suggest that some time- and temperature-dependent blockages develop in the interconversion of C-pathway intermediates and possibly in the flow of other intermediates to and from the sites of C-photosynthesis. Levels of ATP in the leaves of Sorghum, Paspalum, and Amaranthus increased at night and following chilling and did not fall until pronounced necrosis of the leaves commenced. 22 references, 4 figures, 3 tables.

• Research Organization: Dept. of Scientific and Industrial Research, Palmerston North, New Zealand
• OSTI ID: 5721188
• Journal Information: Plant Physiol.; (United States), Journal Name: Plant Physiol.; (United States) Vol. 49; ISSN PLPHA
• Country of Publication: United States
• Language: English

Related Subjects

560303* -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AMBIENT TEMPERATURE
AMINO ACIDS
ATP
BIOLOGICAL EFFECTS
BIOLOGICAL PATHWAYS
CARBOHYDRATES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBOXYLIC ACIDS
CEREALS
CHALCOGENIDES
CHEMICAL REACTIONS
ELECTROMAGNETIC RADIATION
GRASS
LEAVES
NECROSIS
NUCLEOTIDES
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PATHOLOGICAL CHANGES
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PLANTS
POLYSACCHARIDES
RADIATIONS
REAGENTS
RESPONSE MODIFYING FACTORS
SACCHARIDES
SORGHUM
STARCH
SYNTHESIS
TEMPERATURE EFFECTS
UPTAKE
VISIBLE RADIATION