منابع مشابه
Conformation of chloroplast DNA in wheat leaves
Sedimentation and electron microscopic studies have provided no evidence for the presence of circular DNA (deoxyribonucleic acid) in chloroplasts from wheat leaves. Electron microscopy of osmotically disrupted chloroplasts has revealed the presence of linear duplex filaments, some with a tertiary helicoidal configuration and possibly monostranded filaments. None of these structures was observed...
متن کاملRole of carbohydrates in proline accumulation in wilted barley leaves.
The effect of wilting on proline synthesis, proline oxidation, and protein synthesis-all of which contribute to proline accumulation-was determined in nonstarved barley (Hordeum vulgare L.) leaves. Nonstarved leaves were from plants previously in the light for 24 hours and starved leaves were from plants previously in the dark for 48 hours. Wilted leaves from nonstarved plants accumulated proli...
متن کاملChloroplast Division and DNA Synthesis in Light-grown Wheat Leaves.
Light-grown 7-day-old wheat seedlings (Triticum aestivum, var. Maris Dove) showed an increase of 200% in plastids per cell between 1.7 and 4.5 centimeters from the leaf base. This increase was the result of divisions of young chloroplasts at various stages of development, and was well separated in distance, and therefore in time from the region of cell division in the basal meristem. [(3)H]Thym...
متن کاملWheat leaves emit nitrous oxide during nitrate assimilation.
Nitrous oxide (N(2)O) is a key atmospheric greenhouse gas that contributes to global climatic change through radiative warming and depletion of stratospheric ozone. In this report, N(2)O flux was monitored simultaneously with photosynthetic CO(2) and O(2) exchanges from intact canopies of 12 wheat seedlings. The rates of N(2)O-N emitted ranged from <2 pmol x m(-2) x s(-1) when NH(4)(+) was the ...
متن کاملEffect of Wilting on Carbohydrates during Incubation of Excised Bean Leaves in the Dark.
Excised bean (Phaseolus vulgaris) leaves were used to compare the changes in various carbohydrates during dark incubation in a wilted and turgid condition. After a rapid (less than 1 hour) wilt, leaves were incubated at a constant water content (75% of original fresh weight).The starch content of the wilted leaves decreased faster than it did in the turgid leaves. This accelerated starch loss w...
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 1939
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.14.3.559