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Plant density effects on quinoa yield, leaf anatomy, ultrastructure and gas exchange

Published online by Cambridge University Press:  25 August 2022

J. A. González Open the ORCID record for J. A. González [Opens in a new window] ,
M. I. Mercado Open the ORCID record for M. I. Mercado [Opens in a new window] ,
L. Martinez-Calsina ,
L. E. Erazzú ,
S. E. Buedo ,
D. A. González  and
G. I. Ponessa
J. A. González
Affiliation:
Instituto de Ecología, Comportamiento y Conservación, Fundación Miguel Lillo, Miguel Lillo 251, Tucumán, Argentina
M. I. Mercado*
Affiliation:
Instituto de Morfología Vegetal, Fundación Miguel Lillo, Miguel Lillo 251, Tucumán, Argentina
L. Martinez-Calsina
Affiliation:
Famaillá, Instituto Nacional de Tecnología Agropecuaria (INTA), Tucumán, Argentina Facultad de Agronomía y Zootecnia, Universidad Nacional de Tucumán, Tucumán, Argentina
L. E. Erazzú
Affiliation:
Famaillá, Instituto Nacional de Tecnología Agropecuaria (INTA), Tucumán, Argentina Facultad de Agronomía y Zootecnia, Universidad Nacional de Tucumán, Tucumán, Argentina
S. E. Buedo
Affiliation:
Instituto de Ecología, Comportamiento y Conservación, Fundación Miguel Lillo, Miguel Lillo 251, Tucumán, Argentina
D. A. González
Affiliation:
Instituto de Bioprospección y Fisiología Vegetal (INBIOFIV), CONICET-UNT; Facultad de Ciencias Naturales e Instituto Miguel Lillo, Tucumán, Argentina
G. I. Ponessa
Affiliation:
Instituto de Morfología Vegetal, Fundación Miguel Lillo, Miguel Lillo 251, Tucumán, Argentina
*
Author for correspondence: M. I. Mercado, E-mail: [email protected]
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Abstract

To study the impact of plant density on Chenopodium quinoa (c.v. CICA-17) achene yield and its relationship with morphology, leaf anatomy and gas exchange in the absence of water stress, field trials were conducted at 1995 m asl in Northwestern Argentina. Two plant densities were evaluated; low density (LD) 7.2 plants/m (120 240 pl/ha) and high density (HD) 27.9 plants/m (465 930 pl/ha). HD treatment caused light competition, inducing morphological and anatomical changes in Quinoa plants. Plants grown under HD conditions showed decreases in plant height and stem diameter, lower stomatal dimensions and densities, and thinner leaf blades. Compensation strategies such as increases in specific leaf area and a higher number chloroplasts per palisade cell were observed, nevertheless these changes did not fully compensate C absorption and gas exchange limitations, therefore limiting the uptake of N and P and resulting in a 53.2% lower yield of HD compared to LD. Considering the ability of quinoa plants to change its morphology and anatomy, further studies with intermediate plant densities are necessary in order to determine if it is possible to achieve higher yields and to increase the efficiency in the use of the resources.

Keywords

Argentinachloroplastleaf anatomylight competitionphotosynthesis
Type
Crops and Soils Research Paper
Information
The Journal of Agricultural Science , Volume 160 , Issue 5 , October 2022 , pp. 349 - 359
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press

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