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Leaf development and phloem transport in Cucurbita pepo: Carbon economy by Robert Turgeon; J. A. Webb is a Agricultural and Biological Sciences article available to read on EtoBox.

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Net photosynthesis, dark respiration and growth for leaf 5 of Cueurbita pepo L. plants grown under controlled conditions were measured and the data used for an assessment of the changes in carbon balance during growth of the leaf through expansion to maturity. The blade is first capable of net CO s fixation when ca. 8 % expanded but the initial rapid growth during this period is sustained almost entirely through imported nutrients. When the growth rate starts to decline rapidly the net photosynthetic capacity of the blade begins to increase. This increase is accompanied by an expansion of the intercellular spaces and by decreasing dark respiration measured at night and in dark periods during the day. The blade becomes completely independent of phloem imported nutrients and begins to export excess photosynthate when the phase of rapid decrease in relative growth rate is almost complete at about 45% expansion. Maximum net photosynthesis of ca. 11 mg CO~. h -1 dm -2 is achieved at 70% expansion. The first detectable synthesis of the transport sugars stachyose and raffinose in the blade coincides with the beginning of intralaminar phloem transport fl'om the tip to the base of the leaf.

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Author

Robert Turgeon; J. A. Webb

Publisher

Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0032-0935)

Published

1975

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)