Gas exchange of vine cuttings obtained from two graftings submitted to water deficiency

• Author(s): Regina, Murillo; Soares, A.; Souza, Claudia;
• Abstract: The present work aimed to evaluate the water deficiency effect and two graftings on the gas exchange of vine cuttings under greenhouse conditions. Niagara Rosada (Vitis labrusca) was used as scion, and 101 - 14 (V riparia x V rupestris) and 1103 Paulsen (V rupestris x V berlandieri) were used as rootstocks. Twelve days after watering suspension, the leaf water potential of the combination Niagara Rosada/101 - 14 showed lower (-2.80 MPa) in relation to Niagara Rosada/1103 Paulsen (-2.10 MPa) in the non-irrigated plants, while relative water content altered only among watering levels. With the progress of water stress, there was a marked reduction in the gas exchange of the cultivar Niagara Rosada, which presented values close to zero, due to stomatal closure, without differences among the rootstocks. Only after twelve days without water the rootstocks influenced water use efficiency and photochemical efficiency of photosystem II, where the combination Niagara Rosada/101 - 14, presented lowest values to 1103 Paulsen, However, during water removal, the rootstock did not influence gas exchange of the Niagara Rosada, showing the same behavior in water deficiency.
• Publication Date: Oct 2001
• Journal: Pesquisa Agropecuaria Brasileira