RESUMO
The adaptive potential of plants is commonly used as an indicator of genotypes with higher breeding program potential. However, the complexity and interaction of plant metabolic parameters pose a challenge to selection strategies. In this context, this study aimed to explore phenotypic plasticity within the germplasm of Hybrid Timor coffee. Additionally, we assessed the utility of the multivariate phenotypic plasticity index (MVPi) as a promising tool to predict genotype performance across diverse climatic conditions. To achieve this, we evaluated the performance of seven accessions from the Hybrid Timor germplasm in comparison to the Rubi and IPR 100 cultivars, known for their susceptibility and resistance to drought, respectively. The experiment took place in a greenhouse under two conditions: one with normal soil moisture levels near maximum capacity, and the other with a water deficit scenario involving a period of no irrigation followed by rehydration. Data on physiological and biochemical factors were collected at three stages: before applying the water deficit, during its imposition, and after rehydration. Growth data were obtained by the difference between the beginning and end of the experimental period Furthermore, field evaluations of the productivity of the same genotypes were carried out over two consecutive seasons. Based on physiological and biochemical assessments, the MVPi was computed, employing Euclidean distance between principal component multivariate analysis scores. Subsequently, this index was correlated with growth and productivity data through linear regressions. Our findings reveal that the plastic genotypes that are capable of significantly altering physiological and biochemical parameters in response to environmental stimuli exhibited reduced biomass loss in both aerial and root parts. As a result, this positively influenced their productivity. Enhanced plasticity was particularly prominent in accessions from the MG Germplasm Collection: MG 311-Hybrid Timor UFV 428-02, MG 270-Hybrid Timor UFV 377-21, and MG 279-Hybrid Timor UFV 376-31, alongside the Rubi MG 1192 cultivar. The MVPi emerged as a valuable instrument to assess genotype adaptability and predict their performance under varying climatic scenarios.
RESUMO
Sementes de Cupania vernalis Cambess. possuem características recalcitrantes quando submetidas à secagem, além de curta longevidade, necessitando da aplicação de conhecimentos relacionados a fatores que interferem no armazenamento. Objetivou-se com esta pesquisa avaliar as variações fisiológicas de sementes de C. vernalis quando submetidas a diferentes temperaturas e teores de água, durante o armazenamento. No armazenamento, sementes com graus de umidade de 40 por cento, 35 por cento e 30 por cento foram acondicionadas em sacos plásticos e armazenadas sob temperatura controlada de 10ºC e 25ºC, com umidade relativa de 60 por cento, avaliadas quanto ao grau de umidade, porcentagem de germinação e índice de velocidade de emergência, nos tempos de 0, 120 e 240 dias. O tratamento em que as sementes continham 40 por cento de grau de umidade e armazenadas a temperatura de 10ºC favorece a conservação das sementes de C. vernalis.
Cupania vernalis Cambess. seeds have a short longevity with a recalcitrant behavior when submitted to drying. This demands development and adoption of technologies to improve storage and conservation of the seeds. Thus, the objective of this work was to evaluate physiological aspects of Cupania vernalis seeds at different storage temperatures and to different seed moisture content. Seeds with 40 percent, 35 percent and 30 percent of water content were conditioned in plastic bags and stored at 10ºC and 25ºC under controlled temperature and relative humidity around of 60 percent. During 0, 120 and 240 days of storage seeds were taken for evaluation of water content, germination, emergency index. The treatments in which seed contained moisture content of 40 percent and stored at temperature of 10ºC helps the conservation of seeds of C. vernalis.