EFFECT OF PHOTOPERIOD AND WATER SUPPLY ON APICAL ABSCISSION OF LONG‐SHOOTS OF TILIA CORDATA MILL.

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Abstract
Summary: Growth of long‐shoots of Tilia cordata Mill, is sympodial and indeterminate. Abscission of the apex occurs rapidly in short days. In natural conditions abscission occurs in a large proportion of shoots before, or shortly after, the summer solstice when daylength is 17 to 18 h. An experimental study shows that even in long days, if plants are pot‐bound and watered infrequently, apical abscission occurs within a few days of the buds opening. Transferring plants to a large volume of soil or watering frequently delays abscission for several weeks. On a high proportion of plants, which have been either exposed to short days, or deprived of water, defoliation in early or midsummer causes the buds to open, but by late summer buds on the majority of plants are dormant.

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