Department of Biology, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia.
Office of Academic Research, Qatar University, Doha 2713, Qatar.
Funct Plant Biol. 2023 Nov;50(11):915-931. doi: 10.1071/FP22140.
We evaluated the effects of different concentrations (0.05 and 0.15mM) of a benzothiazine (BTh) derivative on wheat (Triticum aestivum L.) in normal (100% field water capacity, FWC) and drought (60% FWC) conditions. Various morphological and physiological characteristics, and the uptake of osmo-protectants and nutrients were measured under the two FWC conditions. Results show that the drought conditions significantly reduced plant growth, affected plant composition, reduced the concentrations of photosynthetic pigments and affected gaseous exchange attributes, stomatal behaviour, and uptake fluxes of essential nutrients, while increasing the contents of different osmo-protectants and enzymatic and non-enzymatic antioxidants to decrease the production of reactive oxygen species (ROS) within the cells/tissues. However, seed priming with BTh reduced water stress conditions by increasing plant growth and biomass, photosynthetic pigments, stomatal behaviour, different gaseous exchange attributes, and uptake fluxes of essential nutrients compared with unprimed plants. In addition, the plant has a strong antioxidant defense system, which further increased its activities under BTh derivative treatments, to scavenge ROS production and maintain cell turgor under water stress conditions. In conclusion, drought stress-induced oxidative stress and altered the growth of T. aestivum , whereas seed priming increased plant growth and antioxidant production by improving the plant tolerance to drought. We suggest that seed priming with a BTh derivative as an effective priming technique in T. aestivum for reducing drought stress tends to benefit a grower in terms of better growth to fulfil the market demand for food cereals.
我们评估了不同浓度（0.05 和 0.15mM）苯并噻嗪（BTh）衍生物对正常（100%田间持水量，FWC）和干旱（60%FWC）条件下小麦（Triticum aestivum L.）的影响。在两种 FWC 条件下，测量了各种形态和生理特性，以及渗透保护剂和养分的吸收情况。结果表明，干旱条件显著降低了植物生长，影响了植物组成，降低了光合色素浓度，并影响了气体交换特性、气孔行为以及必需养分的吸收通量，同时增加了不同渗透保护剂以及酶和非酶抗氧化剂的含量，以减少细胞/组织内活性氧（ROS）的产生。然而，与未经处理的植物相比，用 BTh 对种子进行引发处理可通过增加植物生长和生物量、光合色素、气孔行为、不同气体交换特性以及必需养分的吸收通量来减轻水分胁迫条件。此外，植物具有强大的抗氧化防御系统，在 BTh 衍生物处理下进一步增强了其活性，以清除 ROS 产生并在水分胁迫条件下维持细胞膨压。总之，干旱胁迫引起的氧化应激改变了 T. aestivum 的生长，而种子引发通过提高植物对干旱的耐受性来增加植物生长和抗氧化剂的产生。我们建议，用 BTh 衍生物对种子进行引发处理是减少 T. aestivum 水分胁迫的有效引发技术，这对种植者而言有助于更好地生长，以满足粮食谷物市场的需求。
