SciELO - Scientific Electronic Library Online

 
vol.70Seed germination and development of orchid seedlings (Cyrtopodium saintlegerianum) with fungiAnatomical structure of vegetative organs of Blutaparon vermiculare (Amaranthaceae) y Funastrum glaucum (Apocynaceae), species growing in the Venezuelan coastal zones author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Rodriguésia

Print version ISSN 0370-6583On-line version ISSN 2175-7860

Abstract

OLIVEIRA, Érica Caldas S. de; COSTA JUNIOR, Everaldo O.; FERNANDES, Pedro D.  and  QUIRINO, Zelma Glebya M.. Phenological study of populations of Cnidoscolus quercifolius in the Western Seridó, Paraiba state, Brazil. Rodriguésia [online]. 2019, vol.70, e02352016.  Epub Mar 18, 2019. ISSN 0370-6583.  http://dx.doi.org/10.1590/2175-7860201970001.

The phenological patterns of two populations of Cnidoscolus quercifolius were evaluated in the western Seridó region of Paraiba state, Brazil, from March 2009 to February 2011, with data collected monthly. The evaluations have addressed the quantitative method of analysis that represents the activity indices for both populations growing seasons (fall and sprout) and reproductive (flowering and fruiting), and also studied the intensity index Borchert, who evaluated the flow leaves. The stages were evaluated with respect to variations in rainfall, water potential of plant and quantum efficiency of photosystem II. The bud in the two populations occurred in the late dry season and transition into the rainy season, with peak leafing in January and November 2010 and was negatively correlated with rainfall (rs = -0.54 p <0.05). Leaf fall showed the peak phase in October 2009 and 2010, showing a direct relationship with water potential and photosynthetic quantum efficiency. The flowering and fruiting had greater synchrony in the seasonal rainy period, fruit set was positively correlated with precipitation values during the study period (rs = 0.56 p <0.05). The phenological events of C. quercifolius show marked seasonality in relation to precipitation, water potential and the quantum efficiency of photosystem II.

Keywords : Euphorbiaceae; phenology; semiarid.

        · abstract in Portuguese     · text in English     · English ( pdf )