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Photosynthesis is responsible for the primary productivity and maintenance of life on Earth, boosting biological activity and contributing to the maintenance of the environment. In the past, traditional crop improvement was considered sufficient to meet food demands, but the growing demand for food coupled with climate change has modified this scenario over the past decades. However, advances in this area have not focused on photosynthesis per se but rather on fixed carbon partitioning. In short, other approaches must be used to meet an increasing agricultural demand. Thus, several paths may be followed, from modifications in leaf shape and canopy architecture, improving metabolic pathways related to CO

n recent years the water availability has been strongly affected by generating negative impacts on plants. Mechanisms that allow the plants to resist prolonged periods of drought have been a strategy for maintenance of agricultural production. With this, the aim of this work was to evaluate the use of salicylic acid as a strategy to mitigate the effects of water deficit on plants of Basil (Ocimum basilicumL.). The treatments consisted of: T1-irrigated Plantswithout the application; T2-Plants irrigated with the application; T3-non-irrigated Plants without the application; and T4-plants irrigated with the application. In relation to the Visual symptoms, salicylic acid dampen the wilting of plants not irrigated, not interfering too at the time of Basil plants. Regarding stomatal conductance, there was an increase of over 100% for non-irrigated plants with (T4) when compared to non-irrigated plants without the (T3). For the leaf temperature, the water deficit influenced the increase in temperature. In relation to the relative content of water there has been an increase of 44.5% with application of the plants not irrigated (T4) compared with non-irrigated plants without the (T3). In relation to the relative contentof water there has been an increase of 44.5% with application of the plants not irrigated (T4) compared with non-irrigated plants without the (T3). We concluded that the salicylic acid contributed positively as buffer the effects of water stress on Basilplants, promoting an increase in stomatal conductance and relative water content.

The Adenine Nucleotide Transporter 1 (ADNT1) carrier resides in the mitochondrial inner membrane of plants. Unlike other ADP/ATP carriers, ADNT1 mediates preferably an exchange of mitochondrial matrix ATP by cytosolic AMP, and, to a lesser extent, cytosolic ADP. Because we have previously demonstrated that ADNT1 expression is stronger in senescing tissues, we investigated here the role of ADNT1 carrier during natural and dark-induced senescence in Arabidopsis thaliana. ADNT1 deficient lines displayed an early onset of developmental senescence during both natural and dark-induced senescence. In agreement, moderate loss of chlorophyll content and a reduced PSII photochemical efficiency (Fv/Fm) was observed in the ADNT1 deficient lines at the end of an extended period of darkness. Despite these changes, minor alterations in the levels of sucrose and protein were observed in the ADNT1 deficient lines during dark treatment. However, the levels of a few amino acids as well as the tricarboxylic acid cycle intermediates correlated with ADNT1 expression mainly at the end of dark treatment. Altogether, these results demonstrate that the physiological influence of the AMP/ATP transporter ADNT1 increases during the natural aging and in the later stages of extended darkness treatment. Our data suggest that proper expression of the ADNT1 is important in plant senescence.

In recent years the water availability has been strongly affected by generating negative impacts on plants. Mechanisms that allow the plants to resist prolonged periods of drought have been a strategy for maintenance of agricultural production. With this, the aim of this work was to evaluate the use of salicylic acid as a strategy to mitigate the effects of water deficit on plants of Basil (Ocimum basilicum L.). The treatments consisted of: T1-irrigated Plants without the application; T2-Plants irrigated with the application; T3-non-irrigated Plants without the application; and T4-plants irrigated with the application. In relation to the Visual symptoms, salicylic acid dampen the wilting of plants not irrigated, not interfering too at the time of Basil plants. Regarding stomatal conductance, there was an increase of over 100% for non-irrigated plants with (T4) when compared to non-irrigated plants without the (T3). For the leaf temperature, the water deficit influenced the increase in temperature. In relation to the relative content of water there has been an increase of 44.5% with application of the plants not irrigated (T4) compared with non-irrigated plants without the (T3). In relation to the relative content of water there has been an increase of 44.5% with application of the plants not irrigated (T4) compared with non-irrigated plants without the (T3). We concluded that the salicylic acid contributed positively as buffer the effects of water stress on Basil plants, promoting an increase in stomatal conductance and relative water content. Nos últimos anos a disponibilidade hídrica vem sendo fortemente afetada gerando impactos negativos sobre os vegetais. Mecanismos que permitam as plantas resistirem períodos prolongados de seca vem sendo uma estratégia para manutenção da produção agrícola. Com isso, o objetivo desse trabalho foi avaliar a utilização do ácido salicílico como estratégia de mitigar os efeitos do déficit hídrico em plantas de manjericão (Ocimum basilicum L.). O trabalho foi conduzido em estufa e o delineamento experimental foi inteiramente casualizado. Os tratamentos consistiram em: T1- Plantas irrigadas sem aplicação do AS; T2- Plantas irrigadas com aplicação de AS; T3- Plantas não irrigadas sem aplicação do AS; e T4- Plantas não irrigadas com aplicação de AS. Em relação aos sintomas visuais, o ácido salicílico não atenuou o murchamento das plantas não irrigadas, não interferindo também na altura das plantas de manjericão. Quanto à condutância estomática, houve um aumento de mais de 100% para as plantas não irrigadas com AS (T4) quando comparadas às plantas não irrigadas sem AS (T3). Para a temperatura foliar, o déficit hídrico influenciou no aumento da temperatura. Em relação ao teor relativo de água houve um aumento de 44,5% com aplicação do AS nas plantas não irrigada (T4) comparadas com as plantas não irrigadas sem AS (T3). Conclui-se que o ácido salicílico contribuiu positivamente como atenuador aos efeitos do estresse hídrico em plantas de manjericão, promovendo incremento nas variáveis condutância estomática e teor relativo de água.