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Morpho-physiological responses of indica rice (Oryza sativa sub. indica) to aluminum toxicity at seedling stage

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Abstract

Aluminum (Al) toxicity in acidic soils is a major problem in rice crop production, especially in the acid sulfate soil (pH < 4.0). Selecting Al-tolerant varieties of rice with low toxicity is one of the most appropriate strategies to overcome this problem. In the present study, we investigated the Al content in different rice genotypes, IR64 (high yielding), RD35 (local acidic-tolerant), and Azucena (AZU, positive-check Al-tolerant), and their physiological and morphological adaptations under a wide range Al (10, 25, 50 mM [Al2(SO4)3]) treatments in the greenhouse conditions. Under 50-mM Al treatment, Al levels in the root tissues of rice seedlings cvs. AZU and IR64 were increased by 2.74- and 2.10-fold over control. Interestingly, Al contents in the roots of cv. RD35 were also exhibited by 2.04-fold over control. Similarly, Al contents in the leaves trend to increase in relation to a degree of Al treatments, leading to increase leaf temperature, chlorophyll degradation, limited CO2 assimilation, and negative effect on root traits under 50 mM Al were evidently observed. Therefore, leaf temperature was considered a sensitive parameter regulated by high concentration of Al (50 mM), leading to increase in crop water stress index (CWSI > 0.6) and decrease in stomata conductance. Net photosynthetic rate (Pn) and transpiration rate (E) in rice seedlings of cv. RD35 subjected to 50 mM Al were significantly dropped by 74.76% and 47.71% over the control, respectively, resulting in reduced growth performances in terms of root length (26.57% reduction) and shoot fresh weight (46.15% reduction). An enrichment of Al in the root tissues without toxicity in rice cv. AZU may further help in discovering the Al homeostasis. In summary, Al enrichment in rice genotypes grown under Al-treatments was evidently observed in the root, leading to the limited root growth, root length, and root dry weight, especially in cv. RD35. Al restriction in the root tissues of cv. AZU (Al-tolerant) may play a key role as defense mechanisms to avoid translocation to other organs and the stomata closure was an alternative key factor to limit H2O transpiration.

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Data availability

Data are available under request to the corresponding author.

Abbreviations

Al:

aluminum

AZU:

Azucena

CRD:

completely randomized design

CWSI:

crop water stress index

E :

transpiration rate

EC:

electroconductivity

F v/F m :

maximum quantum yield of PSII

g s :

stomatal conductance

ICP–OES:

inductively coupled plasma–optical emission spectroscope

IRGA:

infrared gas analyzer

ΦPSII :

photon yield of PSII

P n :

net photosynthetic rate

PPFD:

photosynthetic photon flux density

ROS:

reactive oxygen species

T c :

canopy leaf temperature

T dry :

temperature dry reference

T wet :

temperature wet reference

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Acknowledgements

The authors would like to sincerely thank National Science and Technology Development Agency (NSTDA) for funding support (Grant number P-18-51456). MP is thankful to Thailand Graduate Institute of Science and Technology (TGIST) for partial scholarship.

Funding

This work was supported by the National Science and Technology Development Agency (NSTDA) for funding support (Grant Number P-18-51456) and partially support for the Graduate Scholarship for Suwanna Phukunkamkaew by the Thailand Graduate Institute of Science and Technology (TGIST).

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Conceptualization: Suriyan Cha-um, Sarunyaporn Maksup and Rujira Tisarum. Formal analysis and investigation: Suwanna Phukunkamkaew, Piyanan Pipatsitee, Thapanee Samphumphuang. Writing and original draft preparation: Suwanna Phukunkamkaew and Rujira Tisarum. Writing and review and editing: Suriyan Cha-um and Sarunyaporn Maksup. Funding acquisition: Suriyan Cha-um.

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Correspondence to Suriyan Cha-um.

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Consent to publish all authors whose names appear on the submission (1) made substantial contributions to the conception or design of the work or to the acquisition, analysis or interpretation of the data, (2) drafted the work or revised it critically for important intellectual content, (3) approved the version to be published, and (4) agreed to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

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Responsible Editor: Gangrong Shi

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Phukunkamkaew, S., Tisarum, R., Pipatsitee, P. et al. Morpho-physiological responses of indica rice (Oryza sativa sub. indica) to aluminum toxicity at seedling stage. Environ Sci Pollut Res 28, 29321–29331 (2021). https://doi.org/10.1007/s11356-021-12804-1

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  • DOI: https://doi.org/10.1007/s11356-021-12804-1

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