Effect of micropyle orientation on germination of Millettia ferruginea and Delonix regia

Abstract

Introduction: In order to solve the problems related to deforestation and meet the ever increasing demands of the growing population, conserving and wise utilization of the remaining forests and supporting it with additional tree planting are crucial. Proper understanding of efficient management technique including seed sowing methods for target species is vital. Research reports and other information on proper positioning of micropyles in field conditions are lacking for Millettia ferruginea (Hochst.) Baker and Delonix regia (Bojer ex Hook.). This study was initiated to assess variations in germination characteristics of seeds sown at different orientations with respect to the micropyle position and to identify the sowing position that gives the best seed germination outcomes for those tree species when measured by selected parameters. Results: Sowing position where the micropyle of the seed was directed downward has shown the best result with regard to speed of germination, mean germination time, mean daily germination, peak value, germination value, and germination percents for both tree species and was significant for D. regia. Conclusions: It is essential to consider the effects of different sowing positions in achieving production targets with good quality seedlings. The seeds of D. regia should be sown in nurseries carefully by positioning its micropyle downward. Moreover, seeds sown with the micropyle positioned upward showed the least results in terms of germination for both tree species (significant in D. regia).

Effects of salinity stress on seed germination and seedling growth of tomato

“…Mean germination time (MGT) was calculated using the following formula (Gairola et. al., 2011;Zewdie and Welka, 2015):…”

Effects of saponin capped triangular silver nanocrystals on the germination of Pisum sativum , Cicer arietinum , Vigna radiata seeds & their subsequent growth study

“…Overall, the results of germination confirm that there is effect of silver nanotriangles on germination and subsequent growth. Moreover, every seed has a pore-like opening called micropyle, the diameter of which is different for different seeds, but much larger than the nanoparticle size [15,[69][70][71]. Hence, silver nanotringles can easily penetrate inside the seed through this micropyle, which may change the cell membrane of the seeds, along with other cell structures.…”

Seed germination and seedling growth of Chiococca javanica (Rubiaceae) in relation to fruit maturation and media growth

“…Speed of germination was calculated with the following formula (Gairola 2011;Zewdie and Welka 2015) Speed of germination= n1/d1+n2/d2+n3/d3+----------*Note: n = number of germinated seeds, d = number of days.…”

“…Mean germination time was calculated with the formula given by Gairola (2011) and Zewdie and Welka (2015) MGT = n1 x d1 + n2 x d2 + n3 x d3 + --------/ Total number of days *Note: n = number of germinated seed, d = number of days…”

“…(Prasetyo et al 2009) This practice threats species diversity and promotes exhaustion of natural resources (Inácio et al 2013). Such environmental changes are further aggravated by the rapidly increasing population number throughout the world placing high pressure on the forests, which calls for urgent action (Zewdie and Welka 2015). Conservation of utility plants is an important task that promotes species sustainability and maintains healthy ecosystems (Inácio et al 2013).…”