+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Biochemical changes that occur during senescence of wheat triticum aestivum cultivar roy leaves 1. basis for the reduction of photosynthesis



Biochemical changes that occur during senescence of wheat triticum aestivum cultivar roy leaves 1. basis for the reduction of photosynthesis



Plant Physiology (Rockville) 70(6): 1641-1646



Changes in activities of photosynthetic enzymes and photochemical processes were followed with aging of vegetative and flag leaves of wheat (T. aestivum L. cv. Roy). Activities of stromal enzymes began to decline prior to photochemical activities. In general, total soluble protein and the activities of ribulose-1,5-bisphosphate carboxylase and NADP-triose-phosphate dehydrogenase declined in parallel and at an earlier age than leaf chlorophyll (Chl), leaf photosynthesis and photosynthetic electron transport activity. Leaves appeared to lose whole chloroplasts as opposed to a general degradation of all chloroplasts based on 3 lines of evidence. Electron transport activity calculated on an area basis declined much earlier than the same data expressed on a Chl basis. Chl content per chloroplast was similar for mature and senescent tissue and the absorbance at 550 nm (light scattering)/unit of Chl remained essentially constant until the end of senescence. Chloroplasts did, however, undergo some modifications before they were lost (e.g., loss of stromal enzyme activites), but the reduction in leaf photosynthesis was apparently caused by a loss of whole chloroplasts.

Please choose payment method:






(PDF emailed within 1 workday: $29.90)

Accession: 004832125

Download citation: RISBibTeXText


Related references

Biochemical Changes That Occur during Senescence of Wheat Leaves. I. Basis for the Reduction of Photosynthesis. Plant Physiology 70(6): 1641-1646, 1982

Biochemical Changes that Occur during Senescence of Wheat Leaves : I. Basis for the Reduction of Photosynthesis. Plant Physiology 70(6): 1641-1646, 1982

Inhibition of photosynthesis by carbohydrates in wheat triticum aestivum cultivar gabo leaves. Plant Physiology 73(3): 681-686, 1983

Senescence patterns of several physiological and biochemical parameters of field grown flag leaves of triticum aestivum cultivar kolibri. Journal of Plant Physiology 123(4): 327-338, 1986

Effect of l methionine sulfoximine on the products of photosynthesis in wheat triticum aestivum cultivar timmo leaves. Journal of Experimental Botany 35(161): 1800-1810, 1984

Ribulose bis phosphate carboxylase and proteolytic activity in wheat triticum aestivum cultivar arthur leaves from anthesis through senescence. Plant Physiology 64(5): 884-887, 1979

Changes in the activities of enzymes involved in amino acid metabolism during the senescence of detached wheat triticum aestivum cultivar diplomat leaves. Physiologia Plantarum 62(1): 39-44, 1984

The regulation of photosynthesis in leaves of field grown spring wheat triticum aestivum l. cultivar albis at different levels of ozone in ambient air. Plant Physiology 88(4): 1115-1119, 1988

Oleosomes in flag leaves of wheat triticum aestivum cultivar professor manchal their distribution composition and fate during senescence and rust puccinia recondita infection. Planta (Heidelberg) 152(1): 36-43, 1981

Relationship between photosynthesis and respiration the effect of carbohydrate status on the rate of carbon di oxide production by respiration in darkened and illuminated wheat triticum aestivum cultivar gabo leaves. Plant Physiology 71(3): 574-581, 1983

Modelling photosynthesis in flag leaves of winter wheat (Triticum aestivum) considering the variation in photosynthesis parameters during development. Functional Plant Biology 42(11): 1036-1044, 2015

Using combined measurements of gas exchange and chlorophyll fluorescence to estimate parameters of a biochemical C photosynthesis model: a critical appraisal and a new integrated approach applied to leaves in a wheat (Triticum aestivum) canopy. Plant Cell and Environment 32(5): 448-464, 2009

Inactivation of nitrate reductase from wheat triticum aestivum cultivar cvr 306 and rice oryza sativa cultivar cv.p 2 21 leaves. Phytochemistry (Oxford) 20(7): 1487-1492, 1981

Regulation of rna synthesis by dna dependent rna polymerases and rnase during cold acclimation in winter triticum aestivum cultivar talbot and spring wheat triticum aestivum cultivar glenlea. Plant Physiology 78(2): 250-255, 1985

Influence of sink removal in the senescence pattern of wheat triticum aestivum cultivar era. Crop Science 20(1): 19-23, 1980