Articles
EFFECTS OF TEMPERATURE AND DEFOLIATION ON UPPER LEAF NECROSIS IN LILIUM ‘STAR GAZER’
Article number
886_41
Pages
289 – 297
Language
English
Abstract
Upper leaf necrosis (ULN) of Oriental hybrid lilies is a calcium (Ca)-deficiency disorder, commonly observed as leaf tipburn.
Both low transpiration rates due to overlapping young leaves and an unbalanced Ca distribution during the fast growth period cause ULN in Lilium Star Gazer. The aim of this study was to test the effects of environmental temperature and artificial defoliation on reducing ULN. Lilium Star Gazer plants were transferred from a plastic house to phytotrons with day/night temperatures of 15/13, 20/15, 25/20, and 30/25°C at 20 days after planting (DAP). Results showed that the severity of ULN was positively correlated with the time required to complete leaf unfolding.
Lower temperatures (15/13 and 20/15°C) resulted in longer periods for leaves to unfold and thus more-severe ULN. Removing 6-24 leaves from the base at 30 DAP reduced both the percentage of plants with ULN symptoms and ULN severity, but did not affect flowering quality.
These results indicate that upper leaves compete with lower leaves for the same Ca source.
Upper leaf necrosis is related to unbalanced Ca translocation within lily plants.
Both low transpiration rates due to overlapping young leaves and an unbalanced Ca distribution during the fast growth period cause ULN in Lilium Star Gazer. The aim of this study was to test the effects of environmental temperature and artificial defoliation on reducing ULN. Lilium Star Gazer plants were transferred from a plastic house to phytotrons with day/night temperatures of 15/13, 20/15, 25/20, and 30/25°C at 20 days after planting (DAP). Results showed that the severity of ULN was positively correlated with the time required to complete leaf unfolding.
Lower temperatures (15/13 and 20/15°C) resulted in longer periods for leaves to unfold and thus more-severe ULN. Removing 6-24 leaves from the base at 30 DAP reduced both the percentage of plants with ULN symptoms and ULN severity, but did not affect flowering quality.
These results indicate that upper leaves compete with lower leaves for the same Ca source.
Upper leaf necrosis is related to unbalanced Ca translocation within lily plants.
Authors
Ya-Hsun Tsai, Hadi Susilo, Yao-Chien Alex Chang
Keywords
calcium, calcium deficiency disorder, transpiration, leaf unfolding
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