Correlation between carbon isotopic composition and morphological, micromorphological, anatomical, and physiological traits in rice

Concenço, Germani; Brito, Giovani Greigh de; Costa, Vladimir Eliodoro; Silva, Laryssa Barbosa Xavier da; Melo, Thaís Stradioto; Fagundes, Paulo Ricardo Reis; Scivittaro, Walkyria Bueno; Deuner, Sidnei

doi:10.1590/S1678-3921.pab2023.v58.02854

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Plant Physiology / Scientific Notes • Pesq. agropec. bras. 58 • 2023 • https://doi.org/10.1590/S1678-3921.pab2023.v58.02854 copy

Correlation between carbon isotopic composition and morphological, micromorphological, anatomical, and physiological traits in rice

Correlação entre composição isotópica de carbono e traços morfológicos, micromorfológicos, anatômicos e fisiológicos de arroz

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The objective of this work was to verify the correlations between carbon isotopic composition and traits of superior rice genotypes. Twenty genotypes were analyzed for morphology, micromorphology, anatomy, physiological performance, and carbon fingerprint. The plots consisted of 500 L plastic boxes sowed with rice, to allow of a plant density of 300 plants per square meter. Plant anatomy and physiological performance were evaluated using a microscope and an infrared gas analyzer, respectively. There is a correlation between rice water use efficiency (r = 0.45) and carboxylation efficiency (r = 0.39).

Index terms:
Oryza sativa ; carbon fingerprint; gas exchange; plant breeding

Variable	Carbon fingerprint (δ¹³C)
Variable	Spearman	Sig.
2^nd leaf length	0.06	0.798^* * Ties do not allow of the exact p determination by the Spearman’s test. Source: Embrapa Clima Temperado, Pelotas, RS, Brazil, 2019-2020.
Root length	0.10	0.672
Number of roots	0.09	0.710^* * Ties do not allow of the exact p determination by the Spearman’s test. Source: Embrapa Clima Temperado, Pelotas, RS, Brazil, 2019-2020.
Number of tillers	-0.34	0.141^* * Ties do not allow of the exact p determination by the Spearman’s test. Source: Embrapa Clima Temperado, Pelotas, RS, Brazil, 2019-2020.
Nervure density	0.23	0.334
Internervure distance	0.22	0.361
Stomatal density	0.02	0.921^* * Ties do not allow of the exact p determination by the Spearman’s test. Source: Embrapa Clima Temperado, Pelotas, RS, Brazil, 2019-2020.
Stomatal width	-0.08	0.740^* * Ties do not allow of the exact p determination by the Spearman’s test. Source: Embrapa Clima Temperado, Pelotas, RS, Brazil, 2019-2020.
Xylem vessel area	0.04	0.860^* * Ties do not allow of the exact p determination by the Spearman’s test. Source: Embrapa Clima Temperado, Pelotas, RS, Brazil, 2019-2020.
Phloem vessel bundle area	-0.04	0.871
Sclerenchyma in vessel bundle	0.01	0.967
Aerenchyma (%) in central nervure	0.17	0.476^* * Ties do not allow of the exact p determination by the Spearman’s test. Source: Embrapa Clima Temperado, Pelotas, RS, Brazil, 2019-2020.
Transpiration rate	0.09	0.695
Vapor pressure gradient	-0.12	0.617
Photosynthesis rate	0.17	0.280
Internal CO₂	-0.15	0.538
Water use efficiency	0.45	0.003
Stomatal conductance	0.04	0.871
Intrinsic water use efficiency	0.16	0.509
Carboxylation efficiency	0.39	0.092^* * Ties do not allow of the exact p determination by the Spearman’s test. Source: Embrapa Clima Temperado, Pelotas, RS, Brazil, 2019-2020.
Temperature gradient	0.09	0.722^* * Ties do not allow of the exact p determination by the Spearman’s test. Source: Embrapa Clima Temperado, Pelotas, RS, Brazil, 2019-2020.

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