Beet seed priming with growth regulators

Abstract

Seed priming is a technique used to induce metabolic germination processes. Use of growth regulators in seed priming may facilitate increments in physiological processes during seed germination. The objective of this study was to evaluate the effect of priming and growth regulators on beet seed germination. The treatments were cultivar type (Early Wonder, Itapuã and Maravilha) and seed priming technique, which included a control (unconditioned seed) standard hydropriming (water) and a conditioning with salicylic, gibberellic and ascorbic acids, respectively. The treatments were defined by initially testing 0, 1, 2 and 4 mM ascorbic, gibberellic and salicylic acids. Before seed priming, imbibition seed curves were established to determine the optimal conditioning time. After conditioning, the germination, rate of germination, seedling length and seedling dry weight were evaluated. First, the appropriate dosage for conditioning was determined by using a completely randomized experimental design, with four replications per cultivar. Then, a 3 x 5 (cultivar x conditioning technique) factorial design was adopted. Whenever the results were significant by variance analysis, regression analysis was performed. Finally, Tukey's test was used to compare the means at P=0.05. Beet seed priming alters the potential of germination and is influenced by the cultivar and conditioning technique. Pretreatment with 1−2 mM ascorbic, gibberellic or salicylic acids, respectively, promotes beet seed germination, whereas at 1−3 mM, the growth of roots and shoots of beet seedlings is promoted. The most effective techniques to promote germination and growth of sugar beet seedlings were priming with water, salicylic acid or gibberellic acid. Key words: Beta vulgaris. Hydropriming. Gibberellic acid. Salicylic acid. Ascorbic acid. ResumoO condicionamento fisiológico é uma técnica que permite a ativação dos processos metabólicos e fisiológicos na germinação das sementes por meio da utilização de reguladores de crescimento. Desta forma, objetivou-se avaliar o efeito do condicionamento fisiológico de sementes de beterraba com reguladores de crescimento. Foram utilizadas três cultivares: Early Wonder, Itapuã e Maravilha, submetidas a cinco tipos de condicionamentos: testemunha (semente não condicionada) hidrocondicionamento padrão (água), condicionamento com os ácidos salicílico, giberélico e ascórbico. Para definição dos tratamentos, foram testadas doses de 0; 1; 2 e 4 mMol.L -1 dos ácidos. Previamente ao condicionamento, foram realizadas as curvas de embebição das sementes, para determinação do tempo ideal de condicionamento, logo após, as sementes foram avaliadas quanto à porcentagem e velocidade de germinação, comprimento e massa seca de plântulas. O delineamento experimental utilizado foi inteiramente casualizado com quatro repetições, separado para cada cultivar, determinando-se as dosagens adequadas. Na segunda etapa foi adotado esquema fatorial 3 x 5 (cultivares x tipo de condicionamento). Os resultados foram submetidos a análise ...

Effect of Microalgal Extracts from Chlorella vulgaris and Scenedesmus quadricauda on Germination of Beta vulgaris Seeds

“…Sugar beet seed health and quality are crucial for adequate plant growth and they are strictly associated with the productive yield both in terms of quantity and quality of the crop [ 8 ]. Unfortunately, the productivity of sugar beet is often limited by heterogeneous germination in the field, probably due to the presence of inhibitory substances in the pericarp of the seed as well as pathogen attacks [ 9 , 10 ]. Moreover, about 35–40% of the sugar beet seeds need to be discarded before sowing in the field because they are defective [ 11 ].…”

“…For this purpose, different techniques have been adopted in order to increase the physiological potential of sugar beet seeds and their treatment may become an indispensable procedure aiming at the enhancement of the seed vigor and the reduction of the variability in the germination process. Among these, seed priming with water, salicylic acid, or gibberellic acid has been shown to promote sugar beet seed germination as well as enhance sugar beet seedling growth [ 10 ]. Szajsner et al [ 14 ] showed that the seed vigor, germination speed, and the germination time significantly improved by using a magnetic field or a semiconductor laser radiation as pre-sowing treatments of sugar beet seeds.…”

A Multi-year Beneficial Effect of Seed Priming with Gibberellic Acid-3 (GA3) on Plant Growth and Production in a Perennial Grass, Leymus chinensis

“…Seed quality is the basis of adequate plant establishment and is associated with the productive success of crops 1 . Therefore, a variety of strategies are employed in improving seed germination, seedling growth, and productivity.…”

“…Therefore, a variety of strategies are employed in improving seed germination, seedling growth, and productivity. Seed priming, a low-cost and low-risk tool, is considered to be the most effective of these methods 1 – 4 . It comprises a pre-sowing treatment of soaking seeds in a specified solution, allowing some metabolic activities to proceed before germination 5 , 6 , and can increase germination percentage, shorten germination time, and improve seedling establishment 7 , 8 .…”

Selected Plant-Related Papers from the First Joint Meeting on Soil and Plant System Sciences (SPSS 2019)—“Natural and Human-Induced Impacts on the Critical Zone and Food Production”

“…vulgaris ). While the quality of the seeds is essential for proper plant growth and production [ 12 ], the productivity of sugar beet is often limited by the heterogeneity of germination in the field [ 13 , 14 ]. The results show that microalgae extracts can be used as a priming agent, as they increase the efficiency and regularity of the germination process of B. vulgaris seeds.…”