How does water and salt stress affect the germination and initial growth of Brazilian soya bean cultivars?

Zuffo, Alan Mário; Steiner, Fábio; Sousa, Tiago de Oliveira; Aguilera, Jorge González; Teodoro, Paulo Eduardo; Neto, Francisco de Alcântara; Ratke, Rafael Felippe

doi:10.1111/jac.12434

Cited by 6 publications

(6 citation statements)

References 21 publications

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“…Quando o potencial de água do meio de embebição é reduzido, devido ao baixo índice de disponibilidade de água ou alta concentração de sal, a germinação pode ser atrasada ou evitada, dependendo da extensão da redução no potencial (TAIZ et al, 2017). Tais alterações podem provocar reduções no crescimento e desenvolvimento das plântulas de soja, sendo que, os seus efeitos dependem da cultivar (ZUFFO et al, 2020a;ZUFFO et al, 2020b;STEINER et al, 2020).…”

Section: Resultsunclassified

“…A produção agrícola na região do Cerrado está focada no cultivo de duas culturas por safra agrícola, em que os agricultores cultivam principalmente soja/milho ou soja/algodão (ZUFFO et al, 2020a). Porém, a viabilidade técnica e econômica desses modelos de produção agrícola somente é alcançada quando a semeadura da soja, com cultivares precoces ou super precoces, for realizada até o início do mês de novembro.…”

Section: Introductionunclassified

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Identificação de cultivares de soja para tolerância aos estresses hídrico e salino durante a fase de estabelecimento da plântula

Cabral

Zuffo²,

Maekawa³

et al. 2021

Rev. Agro. Amb.

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Os estresses hídrico e salino são apontados como os principais fatores abióticos que limitam a germinação e o estabelecimento da cultura de soja. Estudos que visam identificar cultivares com maior tolerância ao estresse hídrico e a salinidade são importantes para a pesquisa agrícola. A pesquisa foi conduzida com a finalidade de avaliar a tolerância de 25 cultivares de soja aos estresses hídrico e salino durante a fase de germinação e crescimento inicial das plântulas. Os estresses hídrico e salino foram induzidos pela exposição das sementes durante 10 dias a 25 ºC, em soluções com potencial osmótico de -0,30 MPa preparadas com polietilenoglicol PEG-6000 (151,403 g L–1) e NaCl (3,536 g L–1). A partir dos dados de germinação, comprimento e matéria seca das plântulas em condições não estressantes (controle) e estressantes (estresses hídrico e salino), foram calculados os índices de tolerância ao estresse (ITE). As cultivares de soja RK 8317 IPRO, TMG 2383 IPRO, TMG 7061 IPRO, TMG 7063 IPRO e ST 777 IPRO possuem maior tolerância ao estresse hídrico, e são as cultivares mais indicadas para serem semeadas em condições de baixa disponibilidade de água no solo. As cultivares de soja NS 8399 IPRO, NS 7007 IPRO, NS 7505 IPRO, RK 8115 IPRO e TMG 2381 IPRO possuem maior suscetibilidade ao estresse hídrico, e não devem ser recomendadas para o cultivo em condições de baixa disponibilidade hídrica. As cultivares TMG 2383 IPRO, 98R31 IPRO, 98R35 IPRO, ST 777 IPRO, M5917 IPRO, ST 797 IPRO e TMG 7067 são as cultivares mais indicadas para serem cultivadas em solos salinos por apresentarem maior tolerância à salinidade. Por sua vez, as cultivares NS 8399 IPRO, HO Paranaíba IPRO, HO Cristalino IPRO e BMX Foco IPRO são classificadas como suscetíveis à salinidade.

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Section: Resultsunclassified

Section: Introductionunclassified

Identificação de cultivares de soja para tolerância aos estresses hídrico e salino durante a fase de estabelecimento da plântula

Cabral

Zuffo²,

Maekawa³

et al. 2021

Rev. Agro. Amb.

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“…The identification of water-stress-tolerant forage grass cultivars was performed based on all stress tolerance indices using the ranking method proposed by Farshadfar et al [21] and improved by Zuffo et al [45]. In this method, the forage grass cultivars with the highest values for the tolerance indices Y P , Y S , MP, YSI, DI, STI, GMP, YI, k 1 STI, k 2 STI, SSPI, ATI, and HM received a ranking score of 1.…”

Section: Discussionmentioning

confidence: 99%

“…The mean ranking score (R) and the rank standard deviation (RSD) were calculated for all water stress tolerance indices of the nine forage grass cultivars under middle or low soil water regime. The discrimination of forage grass cultivars regarding their tolerance degree to water stress was performed based on the mean ranking score of each grass cultivar, considering the values of the quartiles that divide the nine possible ranking positions (i.e., nine forage grass cultivars) into four equal parts as idealized by Zuffo et al [45]. A cultivar with a mean rank (R) lower than the value of the first quartile (<3.0 points) is classified as tolerant (T); a cultivar with an R between the first and second quartiles (3.1 to 5.0 points) is classified as moderately tolerant (MT); a cultivar with an R between the value of the second and third quartiles (5.1 to 7.0 points) is classified as moderately sensitive (MS); and the group of water-stress-sensitive (S) cultivars is represented by grass cultivar with an R higher than the value of the third quartile (≥7.1 points).…”

Section: Discussionmentioning

confidence: 99%

Selected Indices to Identify Water-Stress-Tolerant Tropical Forage Grasses

Zuffo

Steiner

Aguilera

et al. 2022

Plants

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Periods of soil water stress have been recurrent in the Cerrado region and have become a growing concern for Brazilian tropical pasture areas. Thus, the search for forage grasses more tolerant to water stress has intensified recently in order to promote more sustainable livestock. In a greenhouse experiment, the degree of water stress tolerance of nine tropical forage grass cultivars was studied under different soil water regimes. The investigation followed a 9 × 3 factorial design in four randomized blocks. Nine cultivars from five species of perennial forage grasses were tested: Urochloa brizantha (‘BRS Piatã’, ‘Marandu’, and ‘Xaraés’), Panicum maximum (‘Aruana’, ‘Mombaça’, and ‘Tanzânia’), Pennisetum glaucum (‘ADR 300’), Urochloa ruziziensis (‘Comum’), and Paspalum atratum (‘Pojuca’). These cultivars were grown in pots under three soil water regimes (high soil water regime—HSW (non-stressful condition), middle soil water regime—MSW (moderate water stress), and low soil water regime—LSW (severe water stress)). Plants were exposed to soil water stress for 25 days during the tillering and stalk elongation phases. Twelve tolerance indices, including tolerance index (TOL), mean production (MP), yield stability index (YSI), drought resistance index (DI), stress tolerance index (STI), geometric mean production (GMP), yield index (YI), modified stress tolerance (k1STI and k2STI), stress susceptibility percentage index (SSPI), abiotic tolerance index (ATI), and harmonic mean (HM), were calculated based on shoot biomass production under non-stressful (YP) and stressful (YS) conditions. Soil water stress decreased leaf area, plant height, tillering capacity, root volume, and shoot and root dry matter production in most cultivars, with varying degrees of reduction among tropical forage grasses. Based on shoot biomass production under controlled greenhouse conditions, the most water-stress-tolerant cultivars were P. maximum cv. Mombaça and cv. Tanzânia under the MSW regime and P. maximum cv. Aruana and cv. Mombaça under the LSW regime. P. maximum cv. Mombaça has greater adaptability and stability of shoot biomass production when grown under greenhouse conditions and subjected to soil water stress. Therefore, this forage grass should be tested under field conditions to confirm its forage production potential for cultivation in tropical regions with the occurrence of water stress. The MP, DI, STI, GMP, YI, k2STI, and HM tolerance indices were the most suitable for identifying forage grass cultivars with greater water stress tolerance and a high potential for shoot biomass production under LSW regime.

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“…Several factors such as plant species, cultivar, growth stage, and duration or intensity of stress affect the plant responses to drought [25]. However, seed germination and seedling establishment are the most critical stages for plants' life cycle and drought stress at these stages is one of the major limiting factors that restrict the successful crop establishment [26].…”

Section: Introductionmentioning

confidence: 99%

Changes in Germination and Seedling Traits of Sesame under Simulated Drought

Ahmed¹,

Kheir²,

Mehmood³

et al. 2022

Phyton

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Drought is considered one of the leading abiotic constraints to agricultural crop production globally. Present study was conducted to assess the effects of different drought treatments (viz. Control, 10% PEG, and 20% PEG) on seed germination, germination indices, seedling traits, and drought tolerance indices of sesame. Our results showed that maximum reduction in the studied parameters was observed at higher PEG concentration (i.e., 20% PEG). As compared to control, the drought treatments viz. 10% and 20% PEG decreased the values for germination indices, such as germination percentage, coefficient of variation of germination time, germination index, and seedling vigor index. Similarly, for seedling traits, the values were decreased for root length, shoot length, root shoot ratio, root fresh weight, shoot fresh weight, root dry weight and shoot dry weight under 10% and 20% PEG treatments significantly in comparison with control. Furthermore, relative to control, the values for drought tolerance indices, such as germination drought tolerance index, root length drought tolerance index, shoot length drought tolerance index, total seedling length drought tolerance index, root fresh weight drought tolerance index, shoot fresh weight drought tolerance index, total fresh weight drought tolerance index, root dry weight drought tolerance index, shoot dry weight drought tolerance index and total dry weight drought tolerance index were also reduced under 10% and 20% PEG treatments, respectively. Our results confirms that drought impact on seed germination and seedling traits could be quantified by using different indices which can further help to design drought adaptation and mitigation strategies. Based on these results it can be concluded that germination indices, seedling traits, and drought tolerance indices have great potential to simulate drought stress impacts on different crop traits thus they should be used in all kinds of stress related studies.

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How does water and salt stress affect the germination and initial growth of Brazilian soya bean cultivars?

Cited by 6 publications

References 21 publications

Identificação de cultivares de soja para tolerância aos estresses hídrico e salino durante a fase de estabelecimento da plântula

Identificação de cultivares de soja para tolerância aos estresses hídrico e salino durante a fase de estabelecimento da plântula

Selected Indices to Identify Water-Stress-Tolerant Tropical Forage Grasses

Changes in Germination and Seedling Traits of Sesame under Simulated Drought

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