Partial rootzone drying increases water-use efficiency of lemon Fino 49 trees independently of root-to-shoot ABA signalling

Pérez-Pérez, Juan G.; Dodd, Ian C.; Botía, Pablo

doi:10.1071/fp11269

Cited by 47 publications

(28 citation statements)

References 45 publications

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“…In general, under soil drying, roots produce more ABA than normal conditions (Davies and Zhang 1991). Increased ABA transmits chemical signals (CSs) to shoot via xylem transpiration stream and decreases stomatal conductance (Liu et al 2006, Perez-Perez et al 2012, Amjad et al 2014. Similar is the case in the current experiment where leaf ABA concentration increased linearly under DI and ARD.…”

Section: Discussionsupporting

confidence: 75%

Growth and Physiological Responses of Quinoa to Drought and Temperature Stress

Yang

Akhtar

Amjad

et al. 2016

J Agronomy Crop Science

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Quinoa (Chenopodium quinoa Willd.), traditionally called the mother of grains, has the potential to grow under high temperatures and drought, tolerating levels regarded as stresses in other crop species. A pot experiment was conducted in a climate chamber to investigate the potential of quinoa tolerance to increasing drought and temperature. Quinoa plants were subjected to three irrigation and two temperature regimes. At low temperature, the day/night climate chamber temperature was maintained at 18/8 °C and 25/20 °C for high temperature throughout the treatment period. The irrigation treatments were full irrigation (FI), deficit irrigation (DI) and alternate root‐zone drying (ARD). FI plants were irrigated daily to the level of the pot's water‐holding capacity. In DI and ARD, 70 % water of FI was applied either to the whole pot or to one side of the pot alternating, respectively. The results indicated that plant height and shoot dry weight significantly decreased by ARD and DI compared to FI treatment both at low and at high temperatures. However, plants in ARD treatment showed significantly higher plant height and shoot dry weight compared to DI especially at higher temperature, which is linked to increased xylem ion content. Higher quinoa plant growth in ARD was associated with increase in water‐use efficiency (WUEi) due to higher abscisic acid concentration and higher nutrient contents compared to DI. From results, it can be concluded that quinoa plant growth is favoured by high temperature (25/20 °C) and ARD is an effective irrigation strategy to increase WUE in drought prone areas.

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Section: Discussionsupporting

confidence: 75%

Growth and Physiological Responses of Quinoa to Drought and Temperature Stress

Yang

Akhtar

Amjad

et al. 2016

J Agronomy Crop Science

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“…A/Gs and A/E are very important for plant development under water limited conditions, such as in semi-arid regions. Studies have identified citrus plants with high A/Gs, such as those exhibited by SM, as suitable for semi-arid regions and/or regions with partial irrigation methods8293031.…”

Section: Discussionmentioning

confidence: 99%

Survival strategies of citrus rootstocks subjected to drought

Santana-Vieira

Freschi

Almeida

et al. 2016

Sci Rep

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Two citrus rootstocks, Rangpur lime (RL) and Sunki Maravilha mandarin (SM), were analyzed either ungrafted or grafted with their reciprocal graft combinations or with shoot scions of two commercial citrus varieties: Valencia orange (VO) and Tahiti acid lime (TAL). All graft combinations were subjected to distinct watering regimes: well-watered, severe drought and rehydration. Growth and water relation parameters, gas exchange as well as sugar and hormone profiles were determined. Data indicated that RL adopted a dehydration avoidance strategy and maintained growth, whereas SM adopted a dehydration tolerance strategy focused on plant survival. Compared with RL, the leaves and roots of SM exhibited higher concentrations of abscisic acid and salicylic acid, which induced drought tolerance, and accumulation of carbohydrates such as trehalose and raffinose, which are important reactive oxygen species scavengers. SM rootstocks were able to transfer their survival strategy to the grafted shoot scions (RL, VO, TAL). Because of their contrasting survival strategies, RL reached the permanent wilting point more quickly than SM whereas SM recovered from prolonged droughts more efficiently than RL. This is one of the most complete studies of drought tolerance mechanisms in citrus crops and is the first to use reciprocal grafting to clarify scion/rootstock interactions.

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“…The stomatal closure observed in quinoa plants of present study could be attributed to increased ABA contents under water‐limited conditions. At higher concentration, ABA acts as signalling molecule to induce stomatal closure which eventually decrease conductance (Amjad et al., ; Pérez‐Pérez, Dodd, & Botía, ). This also evidenced from significant negative correlation between ABA and stomatal conductance (Figure a).…”

Section: Discussionmentioning

confidence: 99%

Hydrogen peroxide application improves quinoa performance by affecting physiological and biochemical mechanisms under water‐deficit conditions

Iqbal

Chen

Waqas

et al. 2018

J Agronomy Crop Science

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Quinoa performance reduces under water‐limited conditions and can be improved through exogenous application of stress signalling molecule such as hydrogen peroxide (H2O2). This study was conducted to elucidate the role of H2O2 in quinoa at two water regimes maintained as full irrigated at 100% field capacity (FC~28% soil volumetric water contents; SVWC) and at 60% FC (~17% SVWC) as drought stress. Hydrogen peroxide concentrations, that is 80 mm for seed priming and 15 mm as foliar spray, were used from our preliminary experiments. Drought stress significantly reduced the plant growth, water status, photosynthetic activity and increased reactive oxygen species production (H2O2 and O2•−) resulting in higher oxidative damage in quinoa. Exogenous applied H2O2 as priming agent improved emergence attributes by earlier emergence and made quinoa more tolerant to upcoming drought stress. Nevertheless, exogenously applied H2O2 exhibited significantly higher stomatal conductance (34%), transpiration rate (39%), photosynthetic rate (42%), chlorophyll content index (36%), proline (19%) and total soluble sugar contents (14%) with respect to non‐treated plants under water‐deficit conditions. The H2O2 application regulated the Abscisic acid (ABA) concentration under both conditions and reduced it by 30% in drought‐stressed plants as compared to non‐treated stressed plants. The exogenous application also enhanced the enzymatic antioxidants activities, including SOD, POD, CAT and APX by 32%, 31%, 34% and 53%, respectively, in quinoa plants under drought stress. We conclude that exogenous applied H2O2 improved quinoa performance under drought stress is associated with higher accumulation of osmolytes, regulating ABA level and enhanced enzymatic antioxidant activities.

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Partial rootzone drying increases water-use efficiency of lemon Fino 49 trees independently of root-to-shoot ABA signalling

Cited by 47 publications

References 45 publications

Growth and Physiological Responses of Quinoa to Drought and Temperature Stress

Growth and Physiological Responses of Quinoa to Drought and Temperature Stress

Survival strategies of citrus rootstocks subjected to drought

Hydrogen peroxide application improves quinoa performance by affecting physiological and biochemical mechanisms under water‐deficit conditions

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