Rice Germplasm Innovation and Tolerance to Abiotic Stress

A special issue of Agronomy (ISSN 2073-4395). This special issue belongs to the section "Crop Breeding and Genetics".

Deadline for manuscript submissions: closed (30 September 2024) | Viewed by 3049

Special Issue Editor


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Guest Editor
National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Interests: rice genomics; rice germplasm resource innovation; salt tolerance; gene function analysis
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Special Issue Information

Dear Colleagues,

As the staple food source for around 4 billion people, rice is one of the most important food crops in the world. Currently, with changes to the global climate, rice is facing a great deal of abiotic stresses such as soil salinity, drought, and cold and heat stress. The devolpment of innovative rice germplasm, with strong stress tolerance, is a key step to coping with this challenge. The identification of stress tolerance genes from wild relatives would, in particular, greatly expand the gene pool for rice breeding for stress tolerance. In this respect, innovated rice germplasm provides novel resources for rice breeding, and new insights for the stress tolerance mechanisms of rice.

In this Special Issue, we aim to exchange knowledge on any aspect related to innovations in rice germplasm for abiotic stress tolerance. Including indentificaiton of how new genes respond to abiotic stress, novel gene function analysis, and genetic or physiological mechanisms.

Dr. Weihua Qiao
Guest Editor

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Keywords

  • rice
  • abiotic salt tolerance
  • germplasm innovation
  • gene identification
  • regulation network
  • QTL mapping
  • genomics
  • transcriptomic
  • gene expression
  • natural variation

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Published Papers (2 papers)

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Research

19 pages, 5151 KiB  
Article
Physiological and Transcriptomic Characterization of Rice Genotypes under Drought Stress
by Qian Zhu, Muhammad Ahmad Hassan, Yiru Li, Wuyun Fang, Jingde Wu and Shimei Wang
Agronomy 2024, 14(10), 2247; https://doi.org/10.3390/agronomy14102247 - 29 Sep 2024
Viewed by 1083
Abstract
Drought is a primary abiotic stress that inhibits rice (Oryza sativa L.) growth and development, and during the reproductive stage it has a negative impact on the rice seed-setting rate. This research study examined two rice lines, La-96 (drought sensitive) and La-163 [...] Read more.
Drought is a primary abiotic stress that inhibits rice (Oryza sativa L.) growth and development, and during the reproductive stage it has a negative impact on the rice seed-setting rate. This research study examined two rice lines, La-96 (drought sensitive) and La-163 (drought resistant), for drought stress treatment (with soil moisture at 20% for 7 days) and control (normal irrigation and kept soil moisture ≥40%). To elucidate the photosynthesis and molecular mechanisms underlying drought tolerance in rice, leaf photosynthetic traits and transcriptome sequencing were used to compare differences between two contrasting recombinant inbred lines (RIL) during drought and subsequent recovery at the booting stage. The rice line La-96 showed a significant decrease in seed-setting rate after being treated for seven days’ drought stress (from 86.64% to 22.75%), while La-163 was slightly affected (from 89.04% to 79.33%). The photosynthetic activities of both lines significantly decreased under the drought treatment, and these traits of La-163 recovered to a comparable level with the control after three days of rewatering. The transcriptome of both lines in three treatments (the control, drought stress, and subsequent recovery) were tested, and a total of 16,051 genes were identified, among which 10,566 genes were differentially expressed in various treatments and rice lines. Comprehensive gene expression profiles revealed that the specifically identified DEGs were involved in the ribosome synthesis and the metabolic pathway of photosynthesis, starch, and sucrose metabolism. The DEGs that are activated and respond quickly, as seen during recovery in the tolerant rice line, may play essential roles in regulating subsequent growth and development. This study uncovered the molecular genetic pathways of drought tolerance and extended our understanding of the drought tolerance mechanisms and subsequent recovery regulation in rice. Full article
(This article belongs to the Special Issue Rice Germplasm Innovation and Tolerance to Abiotic Stress)
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12 pages, 5395 KiB  
Article
Submergence Stress Reduces the Ability of Rice to Regulate Recovery after Disaster
by Yanmei Yu, Yan Meng, Peng Chen and Kaihua Cao
Agronomy 2024, 14(6), 1319; https://doi.org/10.3390/agronomy14061319 - 18 Jun 2024
Cited by 2 | Viewed by 1457
Abstract
Flood submergence has devastating effects on agricultural production in China, with rice being particularly vulnerable to its impacts. Previous studies on rice submergence stress have primarily focused on immediate yield reduction and short-term growth. In this study, a submergence stress experiment was carried [...] Read more.
Flood submergence has devastating effects on agricultural production in China, with rice being particularly vulnerable to its impacts. Previous studies on rice submergence stress have primarily focused on immediate yield reduction and short-term growth. In this study, a submergence stress experiment was carried out by using the method of potted rice flooding. The growth recovery characteristics of rice under different submergence stress were analyzed through the continuous observation of rice growth after the disaster. The results showed that submergence stress had a persistent effect on rice growth, which persisted until the recovery period after the disaster. The recovery ability of rice plants decreased with the aggravation of stress, leading to increased damage to the plant. The average yield decreased by 17.07% and 15.56% due to submergence stress during the jointing and booting stage, respectively. The current study pointed out that the growth traits of and, furthermore, the mechanism of physiological changes in rice during the recovery period need to be explored in order to understand the effects of flooding stress on rice. Full article
(This article belongs to the Special Issue Rice Germplasm Innovation and Tolerance to Abiotic Stress)
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