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Agriculture
Special Issues
Auxin Mediated Regulation of Growth and Development in Plants
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Auxin Mediated Regulation of Growth and Development in Plants

A special issue of Agriculture (ISSN 2077-0472). This special issue belongs to the section "Agricultural Product Quality and Safety".

Deadline for manuscript submissions: closed (25 July 2021) | Viewed by 13269

Special Issue Editor

Dr. Nihal Dharmasiri

E-Mail Website
Guest Editor
Department of Biology, Texas State University, San Marcos, TX, USA
Interests: phytohormones; auxin and auxin herbicides; ubiquitin mediated protein degradation; growth and development; stress response
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Auxin, a master regulatory phytohormone, controls many aspects of plant growth and development primarily by regulating cell proliferation, cell expansion, and cell differentiation. While Indole-3-acetic acid represents the major neural auxin in plants, there are several other natural and synthetic chemicals that exhibit auxin-like activities. Several of these “synthetic auxins” are widely used as selective herbicides in agriculture. While auxin is known to control plant physiological processes through both genomic and non-genomic responses, to date, we have a better understanding of molecular mechanisms involved in genomic responses than in nongenomic responses. Recent studies have broadened our knowledge of biosynthesis, transport, signaling, and physiological responses of auxin. Although most fundamental studies on auxin biology have been carried out using the model plant Arabidopsis, the findings of these studies have had a significant impact on agricultural crops.   

This Special Issue mainly focuses on how auxin regulates growth and development in plants, either model plants or crop plants, including the herbicidal action of synthetic auxins. Submission of all types of manuscripts, including original research, current opinions, and reviews related to auxin biology are encouraged.

Prof. Dr. Nihal Dharmasiri
Guest Editor

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Keywords

  • Auxin
  • Hormone signaling
  • Auxin transport
  • Biosynthesis
  • Ubiquitin
  • Protein degradation
  • Auxinic herbicides
  • Phototropism
  • Gravitropism

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Published Papers (3 papers)

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Research

11 pages, 4218 KiB  
Article
Genome-Wide Identification and Expression of the PIN Auxin Efflux Carrier Gene Family in Watermelon (Citrullus lanatus)
by Huaiguo Shang, Na Zhang, Zhouli Xie, Siyu Deng, Licong Yi and Xing Huang
Agriculture 2021, 11(5), 447; https://doi.org/10.3390/agriculture11050447 - 15 May 2021
Cited by 4 | Viewed by 3179
Abstract
As one of the world’s most popular fruits, watermelon (Citrus lanatus) is cultivated in more than 3 million hectares across the globe, with a yearly yield of more than 100 million tons. According to ‘97103’ genome version 1, a previous study [...] Read more.
As one of the world’s most popular fruits, watermelon (Citrus lanatus) is cultivated in more than 3 million hectares across the globe, with a yearly yield of more than 100 million tons. According to ‘97103’ genome version 1, a previous study has shown that the watermelon genome consists of 11 PIN genes. However, the higher quality ‘97103’ genome version 2 was recently assembled by using PacBio long reads with the benefit of fast development sequencing technology. Using this new assembly, we conducted a new genome-wide search for PIN genes in watermelon and compared it with cucumber and melon genomes. We identified nine, nine, and eight PINs in watermelon, cucumber, and melon, respectively. Phylogenetic analysis revealed a distinct evolutionary history of PIN proteins in watermelon, which is shown by the orphan PIN6 in watermelon. We further conducted an expression analysis of the watermelon PIN genes in silico and by qRT-PCR. ClaPIN6 might not play an essential role during shoot regeneration, which is closely related to species-specific evolution. However, the up-regulated expression patterns of ClaPIN1-1 and ClaPIN1-3 indicated their important roles during shoot regeneration. The result of this research will benefit future studies to understand the regulating mechanisms of auxin in watermelon shoot regeneration. Full article
(This article belongs to the Special Issue Auxin Mediated Regulation of Growth and Development in Plants)
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10 pages, 219 KiB  
Article
Peanut (Arachis hypogea) Response to Low Rates of Dicamba at Reproductive Growth Stages
by John W. Seale, Taghi Bararpour, Jason A. Bond, Jeffrey Gore and Bobby R. Golden
Agriculture 2020, 10(9), 408; https://doi.org/10.3390/agriculture10090408 - 16 Sep 2020
Cited by 2 | Viewed by 2714
Abstract
Tank contamination and off-target movement of dicamba is a probable issue facing peanut producers in Mississippi. In 2017 and 2018, a field study was conducted at Mississippi State University’s Delta Research and Extension Center in Stoneville, Mississippi, to evaluate the response of peanut [...] Read more.
Tank contamination and off-target movement of dicamba is a probable issue facing peanut producers in Mississippi. In 2017 and 2018, a field study was conducted at Mississippi State University’s Delta Research and Extension Center in Stoneville, Mississippi, to evaluate the response of peanut to low rates of dicamba at three growth stages. Dicamba at 35 and 17.5 g ae ha−1 with and without non-ionic surfactant (NIS) was applied to peanut at R1 (beginning bloom), R2 (beginning peg), and R3 (beginning pod). In each site year, peanut injury was visible following exposure to dicamba. Peanut lateral growth was also reduced regardless of treatment or growth stage following exposure to dicamba. Peanut injury was most prominent 14 days following exposure to dicamba, regardless of timing in both site years. Peanut yield was not different following dicamba treatments in 2018 due to late-season environmental conditions. In 2017, dicamba at 1/32 X plus NIS, 1/16 X and 1/16 X plus NIS reduced peanut yield 16%, 16%, and 30% when averaged over growth stage, respectively. Based on this study, visible peanut injury, lateral growth reduction, and yield decreases were observed following exposure to dicamba. Full article
(This article belongs to the Special Issue Auxin Mediated Regulation of Growth and Development in Plants)
14 pages, 2174 KiB  
Article
Optimization of Indole-3-Acetic Acid Concentration in a Nutrient Solution for Increasing Bioactive Compound Accumulation and Production of Agastache rugosa in a Plant Factory
by Vu Phong Lam, Mun Haeng Lee and Jong Seok Park
Agriculture 2020, 10(8), 343; https://doi.org/10.3390/agriculture10080343 - 9 Aug 2020
Cited by 9 | Viewed by 6174
Abstract
This study aimed to determine the optimal indole-3-acetic acid (IAA) concentration in a nutrient solution to increase the bioactive compounds while enhancing the plant growth of A. rugosa grown hydroponically. Twenty-eight-day-old plants were transplanted in a plant factory for 32 days. The plants [...] Read more.
This study aimed to determine the optimal indole-3-acetic acid (IAA) concentration in a nutrient solution to increase the bioactive compounds while enhancing the plant growth of A. rugosa grown hydroponically. Twenty-eight-day-old plants were transplanted in a plant factory for 32 days. The plants were subjected to various IAA concentrations (10−11, 10−9, 10−7, and 10−5 M) from 8 days after transplanting, and the control treatment (without IAA). Shoot and root fresh weights were effectively improved under 10−7 and 10−9 IAA treatments. Leaf gas exchange parameters were increased under 10−7 and 10−9 IAA treatments. Four of the IAA treatments, except 10−11 IAA treatment, significantly increased the rosmarinic acid (RA) concentration, as well as the tilianin concentration was significantly increased at all IAA treatments, compared with that of the control. Especially, the tilianin concentration of the 10−11 IAA treatment was significantly (1.8 times) higher than that of the control. The IAA treatments at 10−5 and 10−7 significantly raised the acacetin concentrations (1.6- and 1.7-times, respectively) compared to those of the control. These results suggested that 10−7 concentration of IAA in a nutrient solution was effective for enhancing plant growth and increasing bioactive compounds in A. rugosa, which offers an effective strategy for increasing phytochemical production in a plant factory. Full article
(This article belongs to the Special Issue Auxin Mediated Regulation of Growth and Development in Plants)
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