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首页> 外文期刊>Photosynthetica: International Journal for Photosynthesis Research >Structural and functional damage caused by boron deficiency in sunflower leaves
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Structural and functional damage caused by boron deficiency in sunflower leaves

机译：Structural and functional damage caused by boron deficiency in sunflower leaves

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Sunflowers cv. Romsun 90 were given nutrient solution containing 0.02, 0.2, 2, 20 or 50μM H3BO3. Plants grown for 10 days with 0.02μM B had reduced dry mass of roots and shoots, and brownish purple pigmentation of leaves. Compared with B-sufficient (BS) leaves, leakage from B-deficient (BD) leaves was 20-fold higher for K, 38-fold higher for sucrose, and 6-fold higher for phenolic compounds. A high level of membrane peroxidation was detected in BD plants. Soluble and bound peroxidase activities measured in BD thylakoid membranes were increased 2-fold compared with those in BS membranes. No detectable change was found in soluble peroxidase activity in roots, whereas a 4-fold stimulation in bound peroxidase activity was detected. Thylakoid membranes subjected to low B supply showed enhancement in lipoxygenase activity and malondialdehyde (MDA) content in parallel with 40 and 30% decreases in linoleic and linolenic acid contents. A slower rate of Hill reaction activity (40%) and a suppressed flowof electron transfer of the whole chain (30%) were detected in BD thylakoid membranes. This reduction was accompanied with a decline in the activity of photosystem II shown by a diminished rate of oxygen evolution (42%) coupled with a quenching (27.5%) in chlorophyll a fluorescence emission spectra at 685 nm (F685).

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