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LEAF INITIATION CORRELATES WITH TIME OF MAXIMAL SENSITIVITY OF THE SDP XANTHIUM (ASTERACEAE) TO DARK INTERRUPTION
Author(s) -
Jacobs William P.
Publication year - 1992
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1992.tb13626.x
Subject(s) - xanthium , biology , primordium , asteraceae , botany , gene , genetics
The hypothesis was tested that the well‐known maximal sensitivity to a light break at or near the middle of the dark period of short‐day plant Xanthium is correlated with a specific stage of leaf initiation. Samples were collected at various hours before and during noninductive 6‐hr dark periods. Lengths of leaf primordia were calculated from serial transverse sections. The reproducible results confirmed that leaf initiation occurred at or near middark under the 18:6 hr light: dark growing conditions. The author suggests the working hypothesis that for a light break to be effective in nullifying the effect of a “long” night in photoperiodically sensitive plants, the light must react with a specific early stage of leaf initiation.