Banca de QUALIFICAÇÃO: JOÃO VITOR SOARES MORAIS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE: JOÃO VITOR SOARES MORAIS
DATA: 18/12/2024
HORA: 09:00
LOCAL: Sala virtual: https://meet.google.com/egu-shdu-oxm
TÍTULO: Impact of rice husk biochar as a silicon source on the performance of heirloom cowpea seeds (Vigna unguiculata L. Walp)
PALAVRAS-CHAVES: Silicon nutrition, traditional seed, redox balance, traditional varieties.
PÁGINAS: 25
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
RESUMO:

The use of silicon derived from rice husks as a supplement for cowpea (Vigna unguiculata L. Walp) plants, especially the traditional varieties, has garnered interest due to its potential agronomic benefits. Silicon is known to strengthen plant structure, increase resistance to biotic and abiotic stress, and improve water use efficiency. However, the specific impact of this practice on the performance of traditional cowpea seeds still requires detailed investigation. This study aims to evaluate the effects of rice husk biochar as a silicon supplement on the growth, yield, and drought resistance characteristics of these seeds, providing important insights for the sustainable and efficient management of these crops in diverse agricultural contexts. The experiment was conducted in a completely randomized design with a 3x4x5 factorial scheme, corresponding to three water regimes (50, 70, and 100 %), four biochar doses (0, 8, 24, and 48 g), and five replications. Physiological and biochemical parameters were evaluated 73 days after sowing. Water deficit significantly reduced growth parameters and gas exchange (transpiration and stomatal conductance), while increasing photosynthetic pigments (Chl a, Chl b, and Car), but did not alter net photosynthesis among the water treatments. The lowest water regime combined with Si supplementation increased and correlated non-enzymatic antioxidants (proline, amino acids, and soluble carbohydrates), which likely contributed to the physiological stress adjustment in cowpea plants, mitigating oxidative damage from water deficit and acting in osmoprotection. The changes in physiological effects collectively contributed to the development of silicon-enriched cowpea plants, potentially leading to higher production. In conclusion, rice husk biochar as a silicon source under different water regimes did not increase growth and performance but contributed to cellular homeostasis and increased the yield of cowpea (traditional seed).

MEMBROS DA BANCA:
Externo à Instituição - 059.***.***-94 - JENILTON GOMES DA CUNHA - UNIVASF
Presidente - 1494669 - LUCIANA BARBOZA SILVA
Externo ao Programa - 055.***.***-07 - RUTHANNA ISABELLE DE OLIVEIRA - UFRPE