Principles of resource capture and use of light and water.

Black, C. R.; Randhawa, D.; Ong, C. K.; Wilson, J.

doi:10.1079/9781780645117.0057

Cited by 5 publications

(5 citation statements)

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“…The partial stomatal closure also reduces the water loss by decreasing transpiration and leading to WUE improvement (Black and Randhawa, 2015). Along the increase of WUE, the sweet potato TPB loss under water scarcity allowed them to maintain vital activities during stress.…”

Section: Whole-plant Carbon-water Relationship To Droughtmentioning

confidence: 99%

“…Along the increase of WUE, the sweet potato TPB loss under water scarcity allowed them to maintain vital activities during stress. Both the WUE and WP Δ 13 C are also directly linked to leaf stomatal aperture (Black and Randhawa, 2015;Igamberdiev et al, 2004;Farquhar et al, 1989). According to Farquhar et al (1989), the C3 plants that have greater WUE, showed lower Δ 13 C values (richer in δ 13 C).…”

Section: Whole-plant Carbon-water Relationship To Droughtmentioning

confidence: 99%

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Variation of carbon and isotope natural abundances (δ15N and δ13C) of whole-plant sweet potato (Ipomoea batatas L.) subjected to prolonged water stress

Gouveia

Ganança

Śląski

et al. 2019

Journal of Plant Physiology

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Sweet potato (Ipomoea batatas L.) is an important crop in the world, cultivated in temperate climates under low inputs. Drought changes the plant biomass allocation, together with the carbon and nitrogen isotopic composition (δ 13 C and δ 15 N), whose changes are faintly known in sweet potato crops. Here, we show the biomass allocation of eight sweet potato accessions submitted to drought during 3 months, using the δ 13 C, δ15N, carbon isotope discrimination (Δ 13 C), total carbon (TC) and water use efficiency (WUE) traits. The tolerant accessions had improved WUE, with higher TPB and TC. Storage roots and shoots had a heavier δ 13 C content under drought stress, with greater 13 C fixation in roots. The Δ 13 C did not show a significant association with WUE. The δ15N values indicated a generalised N reallocation between whole-plant organs under drought, as a physiological integrator of response to environmental stress. This information can aid the selection of traits to be used in sweet potato breeding programs, to adapt this crop to climate change. Materials and methods Plant material and experimental setupEight accessions (acc.) of sweet potato (Ipomoea batatas) (designated

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Section: Whole-plant Carbon-water Relationship To Droughtmentioning

confidence: 99%

Section: Whole-plant Carbon-water Relationship To Droughtmentioning

confidence: 99%

Variation of carbon and isotope natural abundances (δ15N and δ13C) of whole-plant sweet potato (Ipomoea batatas L.) subjected to prolonged water stress

Gouveia

Ganança

Śląski

et al. 2019

Journal of Plant Physiology

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“…This complexity has prompted an increased interest of the scientific community in agroforestry systems that started with more descriptive work and then moved to more complex studies trying to understand the mechanisms behind resource sharing between intercropped plants and the quantification of these processes for plant growth (Black et al 2015;van Noordwijk et al 2004). The fast development of different tools and approaches in this field have helped researchers to investigate plant root distributions and structure in these systems for a better understanding of the interactions and processes involved belowground (Cardinael et al 2015;Ong et al 2014;Tracy et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Water acquisition, sharing and redistribution by roots: applications to agroforestry systems

Bayala¹,

Prieto

2019

Plant Soil

104

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Aims In the face of problems caused by 'intensive agriculture' dominated by large areas of monocultures, mixed intercropping mimicking natural ecosystems has been reported to constitute a viable solution to increase and stabilize productivity. When designing such systems, root niche separation was thought to be a prerequisite to optimize production. Methods This paper reviews the beneficial and adverse effects of trees and crops on water acquisition and redistribution in agroforestry ecosystems using the concepts of competition and facilitation between plants in link with root functional traits. Results The results of the review showed that the reality was more complex leading agroforestry practitioners to adopt management practices to induce a separation in root activities thus avoid competition, particularly for water. Water uptake by plant roots is triggered by the water potential difference between the soil and the atmosphere when leaf stomata are open and depends largely on the root exploration capacity of the plant. Thus, root water uptake dynamics are strongly related to root-length densities and root surface areas. In addition, plants with deep roots are able to lift up or redistribute water to the upper layers through a process known as hydraulic lift, potentially acting as "bioirrigators" to adjacent plants. The redistributed water could be of importance not only in regulating plant water status, e.g. by enhancing transpiration, but also in increasing the survival and growth of associated crops in mixed systems. Conclusions Even though some more work is still needed to assess the volume of water transferred to neighbors, hydraulic lift could constitute an ecological viable mechanism to buffer against droughts and ensure productivity in regions with erratic rainfall. Giving the difficulty in measuring the above-mentioned aspects in the field, modeling of some of the most relevant parameters to quantify them might inform the design of future empirical studies.

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“…Reduced transpiration rates compromise nutrient transport from the roots to the shoots, while nutrient stress could be another possible factor stimulating the accumulation of ABA (Firon et al 2009, Duman 2012). Lower transpiration reduces water loss and leads to WUE increase (Black et al 2015). Nonetheless, the stomatal closure restricts the photosynthetic activity and constrains the leaf CO 2 uptake, which leads to a decrease of carboxylation fractionation and drives to Δ 13 C values near to 4‰ (or δ 13 C = −12‰; O'Leary 1993).…”

Section: Discussionmentioning

confidence: 99%

“…The plants that were the most resilient to drought had greater ABA‐shoot production, higher photosynthesis activity, higher chlorophyll content and increased WUE (Tardieu and Davies 1992, Tuberosa 2012, Black et al 2015, Lau et al 2018). Taking into consideration all studied traits, the acc.…”

Section: Discussionmentioning

confidence: 99%

Abscisic acid phytohormone estimation in tubers and shoots of Ipomoea batatas subjected to long drought stress using competitive immunological assay

Gouveia

Ganança

Śląski

et al. 2020

Physiologia Plantarum

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Sweet potato (Ipomoea batatas L.), typically cultivated in temperate climates under low inputs, is one of the most important crops worldwide. Abscisic acid (ABA) is an important plant stress-induced phytohormone. Hitherto, few works analyzed the ABA function in sweet potato tissue growth. Very scarce information is available concerning the ABA role in sweet potato response to water scarcity conditions. Here, we show the ABA content variation in shoots and tubers of eight sweet potato accessions subjected to drought stress. ABA was also related to other resistance traits, such as chlorophyll content index (CCI), carbon isotopic discrimination (Δ 13 C), oxalic acid (OA) and water use efficiency (WUE), to assess stress response mechanisms to water deficit between their organs. The most resilient droughtstressed sweet potato plants accumulated ABA-shoot, and significantly decreased the ABA-tuber content. ABA signaling was related to Δ 13 C and CCI decrease and WUE increment, as an attempt to cope with water stress by partially closing the stomata. The partial closure of stomata could be in part due to the presence of OA-shoots, known to affect the intensity of the ABA-shoot signal in stomatal closure. Higher CCI content and minimal Δ 13 C-shoot differences indicated good carboxylation fractionation, with higher Δ 13 C-tuber content as an indicator of efficient tuber 13 C fixation and growth. Our work demonstrated that ABA could be used in conjunction with the other traits studied for the assessment of sweet potato whole-plant responses to environmental stresses, and thus aid the selection of the best drought tolerant genotypes for breeding programs.

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Principles of resource capture and use of light and water.

Cited by 5 publications

References 0 publications

Variation of carbon and isotope natural abundances (δ15N and δ13C) of whole-plant sweet potato (Ipomoea batatas L.) subjected to prolonged water stress

Variation of carbon and isotope natural abundances (δ15N and δ13C) of whole-plant sweet potato (Ipomoea batatas L.) subjected to prolonged water stress

Water acquisition, sharing and redistribution by roots: applications to agroforestry systems

Abscisic acid phytohormone estimation in tubers and shoots of Ipomoea batatas subjected to long drought stress using competitive immunological assay

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