Study on the Regulatory Effects of GA3 on Soybean Internode Elongation

Abstract

Excessive plant height is an important factor that can lead to lodging, which is closely related to soybean yield. Gibberellins are widely used as plant growth regulators in agricultural production. Gibberellic acid (GA3), one of the most effective active gibberellins, has been used to regulate plant height and increase yields. The mechanism through which GA3 regulates internode elongation has been extensively investigated. In 2019 and 2020, we applied GA3 to the stems, leaves, and roots of two soybean cultivars, Heinong 48 (a high-stalk cultivar) and Henong 60 (a dwarf cultivar), and GA3 was also applied to plants whose apical meristem was removed or to girded plants to compare the internode length and stem GA3 content of soybean plants under different treatments. These results suggested that the application of GA3 to the stems, leaves, and roots of soybean increased the internode length and GA3 content in the stems. Application of GA3 decreased the proportion of the pith in the soybean stems and primary xylem while increasing the proportion of secondary xylem. The apical meristem is an important site of GA3 synthesis in soybean stems and is involved in the regulation of stem elongation. GA3 was shown to be transported acropetally through the xylem and laterally between the xylem and phloem in soybean stems. We conclude that the GA3 level in stems is an important factor affecting internode elongation.

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

“…The same trend can be seen in Figure 3; starting from the injection point, the promoting effect of exogenous GA on the internode length becomes stronger and reaches a peak at around the 25th internode. The GA 3 used in this study was shown to promote internode elongation in various crops, such as soybeans [95], oats [96], and corn [97]. The promotion of internode elongation by GA 3 varied with the distance; we believe that because the injected dose was not saturated relative to the demands of the rapid growth period, this led to large consumption of the exogenous GA 3 near the injection point.…”

Micropropagation of Rauvolfia Tetraphylla L. From in Vitro Seedling Derived Explants Using Various Amino Acids

“…Similarly, BAP and GA3 combination is used for shoot elongation in the micropropagation of Tea clone Iran 100 (Reza et al, 2014) and for shoot elongation in apple stocks (Geng et al, 2016). Gibberellins are known to increase the cell number, thus increasing the length of internodes (Shan et al, 2021).…”

Drug Delivery in Plants Using Silk Microneedles

“…The internode is different because 13‐day‐old barley seedlings had their first internode emerging when treated. Microneedle‐mediated GA 3 delivery also resulted in taller soybean seedlings and increased internodal length [ 24 ] ( n = 5) 3 days post‐treatment (Figure S9f,g, Supporting Information) compared to Control ( p = 2.15 × 10 −5 ), and the GA 3 ‐induced difference was more obvious 6 days after treatment (Figure S9h, Supporting Information). These results demonstrated the effectiveness of microneedles in staple food crops, further confirming their versatility as a payload delivery tool.…”