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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Assessment of leaf ultrastructure offers insights into mechanisms regulating sugarcane performance under low-phosphorus stress

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Zambrosi, Fernando C. B. [1] ; Mesquita, Geisa L. [2] ; Tanaka, Francisco A. O. [2]
Total Authors: 3
[1] Inst Agron IAC, Ctr Solos & Recursos Ambientais, POB 28, BR-13020902 Campinas, SP - Brazil
[2] Univ Sao Paulo, Dept Fitopatolgia, POB 09, BR-13418900 Piracicaba, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: ACTA PHYSIOLOGIAE PLANTARUM; v. 42, n. 4 MAR 31 2020.
Web of Science Citations: 0

Detailed studies of plant responses to phosphorus (P) deficiency might reveal opportunities to improve sugarcane performance under nutrient stress, termed as P use efficiency. Then, we aimed through transmission electron microscopy to offer insights into the effects of varying P supply on leaf ultrastructural traits influencing photosynthesis and leaf area formation. Plants of the genotype RB86-7515 were cultivated under varying nutrient supply (0.0125, 0.05, 0.2 and 0.8 mM P) for 4 months. Diagnostic mature leaves were sampled to evaluate ultrastructural organization and P concentration. Leaf area and plant dry mass responded positively to increasing P rates and maximum values were attained at 0.55 mM P. Leaf P concentration increased as a function of nutrient supply, and the greatest area of diagnostic leaf and whole plant growth was associated with 1.80 g kg(-1) P. Under severe deficiency (relative growth <= 30% and leaf P <= 0.90 g kg(-1)) generated with 0.0125- and 0.05-mM P, transmission electron microscopy revealed pronounced damages to leaf ultrastructure. In mesophyll cells, the changes were more intense under the lowest P rate, and included disintegration of the middle lamella, collapse of plasma membrane and distortion of thylakoids. Bundle sheath chloroplasts of the severely P-deficient plants exhibited, compared with those under 0.2- and 0.8-mM P, disorganization of lamellar membrane system. Collectively, these ultrastructural alterations offer insights into how P deficiency affects whole plant photosynthetic capacity and provide possible target traits at canopy level related to sugarcane P use efficiency. (AU)

FAPESP's process: 16/14058-9 - Does Manganese Nutritional Status Affect the Resistance of Sugarcane to Orange Rust?
Grantee:Francisco André Ossamu Tanaka
Support Opportunities: Regular Research Grants