Improving drought tolerance by altering the photosynthetic rate and stomatal aperture via green light in tomato (Solanum lycopersicum L.) seedlings under drought conditions

Abstract The regulation of stomatal aperture is one of the most important strategies for plants to tolerate drought. Green light has been shown to reverse some effects of red light and/or blue light on plant growth and development and can enhance plant defense against biotic and/or abiotic stress by triggering the expression of specific genes. However, the effects of green light on plant drought tolerance are still unknown. To elucidate the effects of green light on plant drought tolerance, tomato (Solanum lycopersicum L.) seedlings were treated with short-term drought stress and were concomitantly exposed to red and blue light-emitting diodes (LEDs) supplemented with or without green light in an environment-controlled growth chamber. The results show that adding green light induced significant decreases in stomatal conductance (gs), which increased the intrinsic and instantaneous water-use efficiency, concomitantly enhanced mesophyll conductance (gm) and maintained relatively high photosynthetic capability under short-term drought stress. Moreover, green light supplementation alleviated stomatal opening and not only involved the downregulation of the SlHA1, 2 and 4 during stomatal opening but also resulted from a SlAREB1-activated signaling pathway, which led to drought tolerance.

• Publication year

  2019

• Venue

  Environmental and Experimental Botany

• Publication date

  2019-11-01

• Fields of study

  Biology, Environmental Science

• Identifiers
  DOI 10.1016/J.ENVEXPBOT.2019.103844
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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