P-protein in tapping panel dryness affected trees of Hevea brasiliensis

• The structural features of P-proteins in the sieve elements of Hevea brasiliensis were studied in relation to Tapping Panel Dryness (TPD) and stimulation of affected bark with ethephon and vitex (a proprietary chemical formulation). The P-protein appears as a narrow, elongated structure in the sieve plate of healthy trees and unaffected parts of TPD affected trees whereas the TPD affected area of trees on rest for three years showed thick P-protein plugs. When the affected bark of TPD trees on rest were treated with ethylene the P-protein present in the active sieve element disappeared, while stimulation with vitex resulted in a positional change in P-protein. Callose deposition that followed in such stimulated sieve elements led to their senescence. The sieve element plugging that regulate photosynthate translocation with reference to TPD is discussed.

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NATURVETENSKAP  -- Biologi (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences (hsv//eng)

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