Effects of exogenous auxin on yield in foxtail millet (Setaria italica L.) when applied at the grain-filling stage

Foxtail millet (Setaria italica L.) is of high nutritious value, which is an important crop in arid and semi-arid regions. The objective of this experiment was to explore the effects of the synthetic auxin naphthalene acetic acid (NAA) on the physiological processes of foxtail millet, and to provide...

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Main Authors: Zhiwei Feng, Jing Zhao, Mengen Nie, Fei Qu, Xin Li, Juanling Wang
Format: Article
Language:English
Published: Frontiers Media S.A. 2023-01-01
Series:Frontiers in Plant Science
Subjects:
Online Access:https://www.frontiersin.org/articles/10.3389/fpls.2022.1019152/full
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author Zhiwei Feng
Jing Zhao
Mengen Nie
Fei Qu
Xin Li
Juanling Wang
author_facet Zhiwei Feng
Jing Zhao
Mengen Nie
Fei Qu
Xin Li
Juanling Wang
author_sort Zhiwei Feng
collection DOAJ
description Foxtail millet (Setaria italica L.) is of high nutritious value, which is an important crop in arid and semi-arid regions. The objective of this experiment was to explore the effects of the synthetic auxin naphthalene acetic acid (NAA) on the physiological processes of foxtail millet, and to provide a theoretical basis and technical approaches for its efficient use in millet cultivation. Two foxtail millet varieties (‘Jingu 21’ and ‘Zhangzagu 5’) were treated with six concentrations of NAA from 0-144 mg L-1 at the grain-filling stage in field experiments. The photosynthetic pigment contents, gas exchange parameters, chlorophyll fluorescence parameters, and grain yield were measured in foxtail millet. The results showed that low concentrations of NAA (18-36 mg L-1) increased the contents of photosynthetic pigments, and increased the activities of antioxidant enzymes, the photosynthetic rate, and the activity of photosystem system II (PS II). At higher NAA concentrations, the facilitation effect of the treatments diminished, showing a clear concentration effect. In this study, yield was significantly and positively correlated with PS II effective quantum yield (Y(II)) and the PSII electron transport rate (ETR), and the net photosynthetic rate (Pn) was significantly and positively correlated with chlorophyll content, stomatal conductance (Gs), Y(II), and ETR. These results also indicated that exogenous NAA application promotes the production of ATP and NADPH by increasing the efficiency of electron transfer within the photosystems and also improved photochemical utilization, which facilitates the fixation and reduction of carbon, ultimately leading to an increase in Pn and increasing grain yield in foxtail millet.
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spelling doaj.art-c2c4f3d1938443e3a9573ef3f1d4e4002023-01-04T18:12:42ZengFrontiers Media S.A.Frontiers in Plant Science1664-462X2023-01-011310.3389/fpls.2022.10191521019152Effects of exogenous auxin on yield in foxtail millet (Setaria italica L.) when applied at the grain-filling stageZhiwei FengJing ZhaoMengen NieFei QuXin LiJuanling WangFoxtail millet (Setaria italica L.) is of high nutritious value, which is an important crop in arid and semi-arid regions. The objective of this experiment was to explore the effects of the synthetic auxin naphthalene acetic acid (NAA) on the physiological processes of foxtail millet, and to provide a theoretical basis and technical approaches for its efficient use in millet cultivation. Two foxtail millet varieties (‘Jingu 21’ and ‘Zhangzagu 5’) were treated with six concentrations of NAA from 0-144 mg L-1 at the grain-filling stage in field experiments. The photosynthetic pigment contents, gas exchange parameters, chlorophyll fluorescence parameters, and grain yield were measured in foxtail millet. The results showed that low concentrations of NAA (18-36 mg L-1) increased the contents of photosynthetic pigments, and increased the activities of antioxidant enzymes, the photosynthetic rate, and the activity of photosystem system II (PS II). At higher NAA concentrations, the facilitation effect of the treatments diminished, showing a clear concentration effect. In this study, yield was significantly and positively correlated with PS II effective quantum yield (Y(II)) and the PSII electron transport rate (ETR), and the net photosynthetic rate (Pn) was significantly and positively correlated with chlorophyll content, stomatal conductance (Gs), Y(II), and ETR. These results also indicated that exogenous NAA application promotes the production of ATP and NADPH by increasing the efficiency of electron transfer within the photosystems and also improved photochemical utilization, which facilitates the fixation and reduction of carbon, ultimately leading to an increase in Pn and increasing grain yield in foxtail millet.https://www.frontiersin.org/articles/10.3389/fpls.2022.1019152/fullfoxtail milletNAAyieldphotosynthesisphysiological characteristics
spellingShingle Zhiwei Feng
Jing Zhao
Mengen Nie
Fei Qu
Xin Li
Juanling Wang
Effects of exogenous auxin on yield in foxtail millet (Setaria italica L.) when applied at the grain-filling stage
Frontiers in Plant Science
foxtail millet
NAA
yield
photosynthesis
physiological characteristics
title Effects of exogenous auxin on yield in foxtail millet (Setaria italica L.) when applied at the grain-filling stage
title_full Effects of exogenous auxin on yield in foxtail millet (Setaria italica L.) when applied at the grain-filling stage
title_fullStr Effects of exogenous auxin on yield in foxtail millet (Setaria italica L.) when applied at the grain-filling stage
title_full_unstemmed Effects of exogenous auxin on yield in foxtail millet (Setaria italica L.) when applied at the grain-filling stage
title_short Effects of exogenous auxin on yield in foxtail millet (Setaria italica L.) when applied at the grain-filling stage
title_sort effects of exogenous auxin on yield in foxtail millet setaria italica l when applied at the grain filling stage
topic foxtail millet
NAA
yield
photosynthesis
physiological characteristics
url https://www.frontiersin.org/articles/10.3389/fpls.2022.1019152/full
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