Developmental changes in the germinability, desiccation tolerance, hardseededness, and longevity of individual seeds of Trifolium ambiguum

Abstract

Variation in individual seed behaviours within a developing population is inherent and inevitable. In this outbreeder, there is significant variation in seed longevity which appears dependent on embryo genotype with little effect of maternal genotype or architectural factors.

A Novel Method to Overcome Coat-Imposed Seed Dormancy in Lupinus albus L. and Trifolium pratense L.

“…However, most species of these genus seeds present coat-imposed seed dormancy [2,30,31] which may cause a seed lot to germinate over months or years. Although genetic factors determine the proportion of seed coat hardnesses [10,31], there are several other factors such as the geographical location [32,33], the earliness of the seeds [11,15], the ecological differences in relation to temperature and relative humidity [32,[34][35][36], and seed storage conditions [37,38]. Previous reports indicated that genotypes and cultivars of Lupinus and Trifolium species have similar seed coat dormancy [22,39,40].…”

“…Water impermeable testa prevents the entry of water into seed and seed remains hard even when appropriate moisture and temperature conditions are provided [5]. The presence of a hard and impermeable seed coat is regarded as a widespread cause of seed dormancy in several important legume species such as in lentil [7], faba bean [8], common bean [9], soybean [10,11], cowpea [12], common vetch [13], alfalfa and clover [14][15][16], and in some other important plant families such as Geraniaceae (Pelargonium sp.) [17], Oleaceae (Fraxinus sp.)…”

Seed and germination characteristics of wild Onobrychis taxa in Turkey

“…In many hard coated seeds, the first action of a hard seed coat is to inhibit water uptake, which is essential for germination (Roberts, 1974;Dittus and Muir, 2010). Several treatments such as scarification, soaking, and wetting have been improved for breaking the dormancy caused by hard seed coat, and helpful results have been achieved by Demir and Ermis (2004) in okra, Patane and Gresta (2006) in Astragalus hamosus L. and Medicago orbicularis (L.) Bartal., Hay et al (2010) in Trifolium ambiguum M.Bieb., and Sadeghi and Khaef (2012) in 3 annual medics. Our findings revealed that there was seed dormancy resulting from hard seed coat in 18 Onobrychis taxa, 14 of them endemic to Turkey.…”

Crecimiento de variedades y componentes del rendimiento de higuerilla (Ricinus communis L.) en Montecillo, Estado de México

“…En especies de polinización cruzada, el origen del embrión diploide y la naturaleza del endospermo triploide es una fuente potencial de variabilidad en el peso de la semilla (Hay et al, 2010). Por todo lo anterior, el objetivo del presente trabajo fue estudiar la variabilidad y adaptación de un grupo de variedades de higuerilla en Montecillo, Estado de México, de abril a diciembre de 2013.…”