Abstract
ABSTRACT The efficiency of seed reserve mobilization (SRM) can be affected by genotype characteristics and seed initial physiological quality, which are determinant for the choice of cultivars that present plants with high physiological performances. The objective of this study was to evaluate the SRM in different common bean cultivars with different vigor and determine the differences in this process between seed lots and cultivars. Six common bean cultivars were grown in the 2017-2018 and 2018-2019 crop seasons in Lages, Santa Catarina, Brazil. The physiological quality of the cultivars was defined by germination test, accelerated aging test, seedling length, and vigor index, establishing two vigor groups (high vigor and low vigor). SRM was evaluated based on seed and seedling dry weights, use of seed reserves, use rate of seed reserves, SRM rate to the seedling, and use efficiency of seed reserves. The high-vigor cultivars presented higher use rates of seed reserves, SRM rate to the seedling, and use efficiency of seed reserves, favoring the development of vigorous seedlings. The evaluation of SRM is an alternative to improve control of internal seed quality and selection of high-vigor common bean cultivars.
Highlights
The use of high-vigor seeds results in a fast, uniform, and complete emergence of seedlings and assists in the competition with weeds and in a uniform plant development, even under adverse conditions (MARCOS-FILHO, 2015a, CHENG et al, 2015).Common bean (Phaseolus vulgaris L.) crops are important in the whole world as source of carbohydrates, proteins, and minerals
Studies on vigor of common bean plants have sought to identify correlations between yield (MONDO; NASCENTE; CARDOSO NETO, 2016), production systems (GINDRI et al, 2017), genetic diversity (GINDRI; COELHO, 2019), biochemistry composition (CASSOL et al, 2016) and enzymatic activity (MORIYA et al, 2015). Such studies do not consider the dynamics of seed reserve mobilization (SRM) in control of internal seed quality and selection of high-vigor common bean genotypes, which is an important strategy to be explored for this purpose
High-vigor cultivars have high use rate of seed reserves (URSR) and seed reserve mobilization rate (SRMR), as shown by the results found for the cultivar BAF55 (Table 2)
Summary
The use of high-vigor seeds results in a fast, uniform, and complete emergence of seedlings and assists in the competition with weeds and in a uniform plant development, even under adverse conditions (MARCOS-FILHO, 2015a, CHENG et al, 2015).Common bean (Phaseolus vulgaris L.) crops are important in the whole world as source of carbohydrates, proteins, and minerals. Studies on vigor of common bean plants have sought to identify correlations between yield (MONDO; NASCENTE; CARDOSO NETO, 2016), production systems (GINDRI et al, 2017), genetic diversity (GINDRI; COELHO, 2019), biochemistry composition (CASSOL et al, 2016) and enzymatic activity (MORIYA et al, 2015). Such studies do not consider the dynamics of seed reserve mobilization (SRM) in control of internal seed quality and selection of high-vigor common bean genotypes, which is an important strategy to be explored for this purpose. The correlations between SRM and seedling development can be affected by intrinsic characteristics of the genotype and seeds, such as biochemical composition (SNIDER et al, 2016), physical properties (PEREIRA; PEREIRA; DIAS, 2013), enzyme production, and enzymatic activity (BEWLEY et al, 2013; CHENG et al, 2015; LAMBERT et al, 2016)
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