SciELO - Scientific Electronic Library Online

vol.26 issue4Weed seedbank and its correlation with the established flora in no-burn sugarcane areaLight and Kno3 on Tridax procumbens seed germination at constant and alternating temperatures author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Planta Daninha

Print version ISSN 0100-8358On-line version ISSN 1806-9681


CANOSSA, R.S. et al. Effect of temperature and light on joyweed (Alternanthera tenella) seed germination. Planta daninha [online]. 2008, vol.26, n.4, pp.745-750. ISSN 0100-8358.

Biology of tropical weeds is still mostly unknown, especially in relation to facts that could be used as cultural tools for weed management. The present work was aimed at evaluating the infuence of temperature and light on germination of Alternanthera tenella seeds. Treatments consisted of four constant temperature regimes (20, 25, 30 and 35 ºC) in absence of light, and constant temperature of 25 ºC in the presence and absence of light. The germination test was conducted with four replicates of 100 seeds per treatment, placed in plastic boxes (gerbox) and kept in BOD Germinator. Germination evaluations were performed at the same time daily, by counting normal seedlings, with visible roots and cotyledons. Total germination and speed of germination velocity index (GVI) were calculated after 34 days and the experiment was run twice. Total germination and germination velocity increased as temperature increased up to 28.2 ºC, decreasing from this temperature on. At 25 ºC, germination and GVI of joyweed seeds increased when the seeds were kept under light.

Keywords : calico plant; seedbank; germination test.

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


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License