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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Duration of cambial activity is determined by water availability while cambial stimulus is day-length dependent in a Neotropical evergreen species

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Author(s):
Totti de Lara, Natalia Oliveira ; da Silva, Magali Ribeiro ; Nogueira, Anselmo ; Marcati, Carmen Regina
Total Authors: 4
Document type: Journal article
Source: ENVIRONMENTAL AND EXPERIMENTAL BOTANY; v. 141, p. 50-59, SEP 2017.
Web of Science Citations: 2
Abstract

Experimental manipulations are essential for understanding the causal factors of plant growth and cambial activity. Here, we studied the potential effect of water availability and natural variation of day length and temperature on cambial activity in Cordiera concolor (Cham.) Kuntze, an evergreen tropical species. Experiments were conducted in a greenhouse using ninety one-year-old plants divided into two groups. Each group was observed for five weeks during two different times of the year (early spring and late summer). Plants were subjected to three distinct water regimes (waterlogging, field capacity and water deficit). Temperature and day length were recorded daily and stem samples were taken weekly during both sampling intervals. Anatomical procedures were used to describe the cambial activity per stem. Our results suggest that soil water content and its influence on cambial activity depend on the time of year, while cambial stimulus was positively related to day length, independent of the time of year. In early spring, cambial activity was stimulated by an increase of day length, regardless of water supply. In contrast, in late summer, cambial dormancy was delayed in waterlogged plants and advanced in plants subjected to a water deficit, followed by decreasing day length. Analyses of the wood anatomy showed that the marginal bands of axial parenchyma were initial. Our study highlights a more complex scenario of plant functioning and its causal factors in tropical systems. (AU)

FAPESP's process: 15/14954-1 - Cambial activity and structure of secondary tissues in angiosperms
Grantee:Carmen Regina Marcati
Support Opportunities: Regular Research Grants
FAPESP's process: 13/05700-0 - Cambial activity in Cordiera concolor (Cham.) Kuntze (Rubiaceae) plants subjected to controlled water regime
Grantee:Natália Oliveira Totti de Lara
Support Opportunities: Scholarships in Brazil - Doctorate