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...
Main Authors: | , , , , , |
---|---|
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 |
_version_ | 1797961586010226688 |
---|---|
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. |
first_indexed | 2024-04-11T01:00:10Z |
format | Article |
id | doaj.art-c2c4f3d1938443e3a9573ef3f1d4e400 |
institution | Directory Open Access Journal |
issn | 1664-462X |
language | English |
last_indexed | 2024-04-11T01:00:10Z |
publishDate | 2023-01-01 |
publisher | Frontiers Media S.A. |
record_format | Article |
series | Frontiers in Plant Science |
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 |
work_keys_str_mv | AT zhiweifeng effectsofexogenousauxinonyieldinfoxtailmilletsetariaitalicalwhenappliedatthegrainfillingstage AT jingzhao effectsofexogenousauxinonyieldinfoxtailmilletsetariaitalicalwhenappliedatthegrainfillingstage AT mengennie effectsofexogenousauxinonyieldinfoxtailmilletsetariaitalicalwhenappliedatthegrainfillingstage AT feiqu effectsofexogenousauxinonyieldinfoxtailmilletsetariaitalicalwhenappliedatthegrainfillingstage AT xinli effectsofexogenousauxinonyieldinfoxtailmilletsetariaitalicalwhenappliedatthegrainfillingstage AT juanlingwang effectsofexogenousauxinonyieldinfoxtailmilletsetariaitalicalwhenappliedatthegrainfillingstage |