Banca de QUALIFICAÇÃO: ARTHUR GOMES LIMA DA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : ARTHUR GOMES LIMA DA SILVA
DATE: 08/02/2021
TIME: 14:00
LOCAL: Videoconferência
TITLE:

Influence of soil type on the physiological changes of Myracrodruon urundeuva Allemão in response to water deficit and subsequent recovery

KEY WORDS:

Aroeira-do-sertão • Water stress • Seasonally dry tropical forest • Climate change • Water potential • Gas exchange

PAGES: 39
BIG AREA: Ciências Biológicas
AREA: Botânica
SUMMARY:

Myracrodruon urundeuva Allemão is an endangered species, native to the Caatinga, which has been listed as a high priority for conservation. Similar to other plants native to semi-arid regions, M. urundeuva can make some morphophysiological adjustments to tolerate periods of water deficit which are common in these regions. Given the effect of climate change on the distribution of M. urundeuva, we aimed to understand how factors such as soil type, in addition to water deficit, affect its performance in the face of drought. The experiment was carried out in a greenhouse in a completely randomized design and a 2x2 factorial scheme. Two types of soil were used: sandy and sandy clay loam; and two water regimens: irrigated and water deficit. Water deficit was imposed by suspending irrigation until the photosynthetic rates were close to zero, with subsequent rehydration until recovery. In sandy soil, M. urundeuva took longer to reach maximum stress (photosynthetic rates close to zero) and required less time for recovery. This likely occurred due to the properties of the soil, which has a lower amount of dissolved solutes, making water more available to the plants compared to the sandy clay loam soil. In contrast, the plants in sandy clay loam soil reduced stomatal opening more prominently, enabling them to increase water-use efficiency (WUE) during moderate water deficit. Thus, the sandy soil allowed a longer time until maximum stress was reached and less time for recovery of M. urundeuva. However, plants in sandy clay loam soil had better stomatal control and increased WUE, ensuring better water conservation during the maximum stress.

BANKING MEMBERS:
Presidente - 1916144 - GILBERTO COSTA JUSTINO
Interna - 2024367 - MELISSA FONTES LANDELL
Externo ao Programa - 1347702 - LAURICIO ENDRES
Externa à Instituição - LILIANE SANTOS DE CAMARGOS - UNESP