Foliar-applied glycine betaine minimizes drought stress-related impact to gas exchange and the photochemical efficiency
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Foliar-applied glycine betaine minimizes drought stressrelated impact to gas exchange and the photochemical efficiency of PSII in sugarcane Sebastia˜o de Oliveira Maia Ju´nior . Jailma Ribeiro de Andrade . Claudiana Moura dos Santos . Joˆnatas Vieira Santos . Lennon Kledson dos Santos Silva . Paulo Ricardo Aprı´gio Clemente . Vilma Marques Ferreira . Jose´ Vieira Silva . Laurı´cio Endres Received: 25 May 2020 / Accepted: 5 September 2020 Ó Brazilian Society of Plant Physiology 2020
Abstract Sugarcane is one of the most important crops in the world, but subject to yield losses caused by sporadic droughts during the growing season. To mitigate the effects of drought stress, different strategies have already been used, including the foliar application of glycine betaine (GB). Thus, the present study aimed to evaluate the effect of GB spraying via leaf on gas exchange, chlorophyll fluorescence and on the sugarcane water status subjected to drought stress and rewatering. The experiment was carried out in a greenhouse, using the RB92579 sugarcane variety. A randomized block design was used, in a 3 9 2 factorial scheme, composed of three GB applications (G0—without GB, G1—one application and G2—two applications) and two water treatments: irrigated (Control) and non-irrigated (Drought Stress), with subsequent rewatering. The foliar application of GB minimized the impact of drought stress on gas exchange, on the photochemical efficiency of photosystem II (PSII) and leaf tissue water status in stressed S. de Oliveira Maia Ju´nior (&) J. R. de Andrade C. M. dos Santos J. V. Santos L. K. dos Santos Silva P. R. Aprı´gio Clemente V. M. Ferreira L. Endres Laborato´rio de Fisiologia Vegetal, Centro de Engenharias e Cieˆncias Agra´rias, Universidade Federal de Alagoas, BR 104 Norte, Km 85, Rio Largo, Alagoas, Brazil e-mail: [email protected] J. V. Silva Laborato´rio de Fisiologia Vegetal, Universidade Federal de Alagoas, Bairro Bom Sucesso, Arapiraca, Alagoas, Brazil
plants. In addition, it favored the energy use in the PSII and reduced photoinhibition, a fact not observed in the G0 stressed plants. Thus, it can be inferred that the GB foliar application mitigates the negative effects of drought stress on gas exchange and photochemical apparatus of PSII in young sugarcane plants. Keywords Saccharum officinarum L. Osmoprotection Photosynthesis Photoinhibition Recovery Abbreviations A Photosynthesis Ci Internal carbon dioxide concentration C Control DAP Days after planting DS Drought stress E Transpiration EXC Excess energy in PSII Fv/ Maximum quantum efficiency of PSII Fm gs Stomatal conductance GB Glycine betaine G0 Without glycine betaine G1 With one application of glycine betaine G2 With two applications of glycine betaine iCE Instantaneous carboxylation efficiency iWUE Intrinsic water use efficiency Phot Photoinhibition PPFD Photosynthetic photon flux density PSII Photosystem II
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Theor. Exp. Plant Physiol.
R RWC WUE UPSII Ww
Rewatering Relat
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