Developmental anatomy of major lateral leaf veins of healthy and of pear-decline diseased pear trees

Kengo Soma and Henry Schneider

Hilgardia, 1971, vol. 40, issue 13

Abstract: In trees affected by pear decline necrosis does not occur in the primary phloem of new shoots that form following chilling; possibly they are pathogen free. Sieve-tube necrosis in secondary phloem is accompanied by excessive and prolonged abnormal phloem formation, and groups of sieve tubes in this abnormal phloem also become necrotic. The necrotic process consists of degeneration of organelles, membranes, and ground cytoplasm.

Keywords: Crop; Production/Industries (search for similar items in EconPapers)
Date: 1971
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