Effects of Short-Day and Gibberellic Acid Treatments on Summer Vegetative Propagation of Napier Grass (Pennisetum purpureumSchumach)

Abstract

The effects of short-day (SD) and gibberellic acid (GA 3 ) treatments on promoting vegetative propagation during the summer were examined in Napier grass (Pennisetum purpureum Schumach). A dwarf variety of late heading type (DL) Napier grass was exposed to three SD treatments (5, 10, and 20 short days plus a spray of 400 ppm GA 3 solution following each SD treatment, GASD) or no treatment (control). Additionally, then, a dwarf variety of early heading (DE) and the normal variety of Merkeron (ME) were exposed to 10 days of GA-SD treatment together with nontreated controls. For DL and DE, GA-SD treatments showed the following effects: 10-day GA-SD treatment increased significantly ( < 0.05) the length of lateral tiller buds, maintained a high rooting percentage, and increased the diameter of the tiller buds. This resulted in a taller plant, one with enhanced tiller numbers, and thus a greater number of established nursery plants for the two dwarf varieties. In contrast, there was only a limited positive effect of the GA-SD treatments on the normal variety, ME. Thus, 10 days of GA-SD treatment was judged to be the most effective treatment for promoting lateral tiller bud elongation and early maturation in tiller buds for the two dwarf varieties of Napier grass.

Enhancing Propagation of Orostachys spp. Offsets through Exogenous GA3 Application

“…Likewise, Binenbaum et al [64] emphasized that GA movement is deemed necessary at multiple stages of development in all plant organs, such as the local accumulation of bioactive GA in the root elongation zone, because it is directly correlated with cellular growth. Other vegetatively propagated plants have also reported root growth with the application of GA, such as Pennisetum purpureum [65], Lemna minor [66], and sugar beets [67], which had similar results to those of Orostachys species.…”

Eficiencia de hormonas naturales y sintéticas en el enraizamiento y desarrollo de estructuras vegetativas de Tilo (Sambucos peruviana) en trópico alto

“…Para esta variable el diagrama de cajas (Figura 6) muestra que el tratamiento T3 (AG3) posee los valores más altos con amplias diferencias respecto de T1 (ANA), T18 (lenteja + canela) y T19 (lenteja + alpiste). Este resultado es consistente con diversas investigaciones en las cuales se evidencia acción positiva del AG3 sobre el desarrollo de varias estructuras vegetativas de plantas forrajeras, donde la adición de la hormona reportó un mayor crecimiento de la planta [24,25,26,27]. Al realizar el ANOVA, se evidencia que la variable efecto de tratamientos es significativo a la variable altura de la planta (p < 0, 05), se cumple entonces la hipótesis de diferencias de medias para al menos uno de los tratamientos en relación a los demás (Tabla 7).…”

Plasticity in the Morphology of Growing Bamboo: A Bayesian Analysis of Exogenous Treatment Effects on Plant Height, Internode Length, and Internode Numbers

“…It is noteworthy that the most apparent effect of GA is to regulate stem length and internode elongation during the growth period by inducing cell division and elongation [42,43]. This was demonstrated in model plants and crops, such as Arabidopsis [44,45], rice [46], maize [23,47], Napier grass [48], and Medicago truncatula [49]. GA is primarily used for dwarfing in agriculture, and there have been many reports on this in crops, such as wheat [50][51][52][53], rice [54,55], maize [56,57], and watermelon [58,59].…”