Aluminum Stress Inhibits Root Growth and Alters Physiological and Antioxidant Enzyme Responses in Alfalfa (Medicago sativa L.) Roots

2019 ◽  
Vol 39 (4) ◽  
pp. 298-302
Author(s):  
Chang-Woo Min ◽  
Inam Khan ◽  
Byung-Hyun Lee
Keyword(s):  
Root Growth ◽  
Medicago Sativa ◽  
Antioxidant Enzyme ◽  
Aluminum Stress

scholarly journals AtHB7/12 Regulate Root Growth in Response to Aluminum Stress

2020 ◽  
Vol 21 (11) ◽  
pp. 4080
Author(s):  
Yang Liu ◽  
Jiameng Xu ◽  
Siyi Guo ◽  
Xianzheng Yuan ◽  
Shan Zhao ◽  
...  
Keyword(s):  
Cell Wall ◽  
Transcription Factors ◽  
Root Growth ◽  
Crop Production ◽  
Expression Patterns ◽  
Acid Soils ◽  
Limiting Factor ◽  
Aluminum Stress ◽  
Al Stress

Aluminum (Al) stress is a major limiting factor for plant growth and crop production in acid soils. At present, only a few transcription factors involved in the regulation of Al resistance have been characterized. Here, we used reversed genetic approach through phenotype analysis of overexpressors and mutants to demonstrate that AtHB7 and AtHB12, two HD-Zip I transcription factors, participate in Al resistance. In response to Al stress, AtHB7 and AtHB12 displayed different dynamic expression patterns. Although both AtHB7 and AtHB12 positively regulate root growth in the absence of Al stress, our results showed that AtHB7 antagonizes with AtHB12 to control root growth in response to Al stress. The athb7/12 double mutant displayed a wild-type phenotype under Al stress. Consistently, our physiological analysis showed that AtHB7 and AtHB12 oppositely regulate the capacity of cell wall to bind Al. Yeast two hybrid assays showed that AtHB7 and AtHB12 could form homo-dimers and hetero-dimers in vitro, suggesting the interaction between AtHB7 and AtHB12 in the regulation of root growth. The conclusion was that AtHB7 and AtHB12 oppositely regulate Al resistance by affecting Al accumulation in root cell wall.

scholarly journals Correlation among Snpb11 markers, root growth, and physiological characters of upland rice under aluminum stress

2019 ◽  
Vol 20 (5) ◽  
Author(s):  
MIFTAHUL HUDA FENDIYANTO ◽  
RIZKY DWI SATRIO ◽  
SUHARSONO SUHARSONO ◽  
ARIS TJAHJOLEKSONO ◽  
M MIFTAHUDIN
Keyword(s):  
Molecular Marker ◽  
Root Growth ◽  
Root Length ◽  
Upland Rice ◽  
Carotenoid Content ◽  
Total Root Length ◽  
Al Tolerance ◽  
Aluminum Stress ◽  
Tolerance Level ◽  
Physiological Characters

Abstract. Fendiyanto MH, Satrio RD, Suharsono, Tjahjoleksono A, Miftahudin. 2019. Correlation among Snpb11 markers, root growth, and physiological characters of upland rice under aluminum stress. Biodiversitas 20: 1243-1254. The cultivation of upland rice in acid soils faces aluminum (Al) toxicity. Development of Al-tolerant rice could be one of the solutions to overcome the problem. Marker-assisted breeding to develop Al-tolerant rice requires at least a molecular marker for foreground selection. Snpb11 is a molecular marker developed from the nucleotide differences in a specific allele between Al-tolerant and sensitive rice. Snpb11 has never been used as a molecular marker in rice. Therefore this study aimed to examine the correlation among Snpb11 marker, root growth, and physiological characters under Al stress in upland rice. We used physiological characters and the Snpb11 marker to justify the Al tolerance level in several upland rice varieties. We found that physiological characters, i.e.: primary root length, total root length, chlorophyll, and carotenoid content showed positive correlation to Snpb11. Conversely, root malondialdehyde content, which represents the level of lipid peroxidation showed a negative correlation to Snpb11. There is evidence that the Snpb11 highly correlated with primary and total root length characters, which are the Al tolerance parameters used in rice. Therefore, Snpb11 markers can be used to distinguish the Al tolerance level in upland rice.

scholarly journals SELEKSI KETAHANAN BEBERAPA KULTIVAR PADI (Oryza sativa L.) LOKAL ASAL KALIMANTAN TIMUR TERHADAP CEKAMAN ALUMINIUM PADA FASE PERKECAMBAHAN

2019 ◽  
Vol 44 (2) ◽  
pp. 178
Author(s):  
Nurul Aini ◽  
Susylowati Susylowati ◽  
Nurhasanah Nurhasanah
Keyword(s):  
Root Growth ◽  
Shoot Growth ◽  
Agricultural Land ◽  
Growth Parameter ◽  
Aluminum Concentration ◽  
Rice Cultivars ◽  
Aluminum Stress ◽  
East Kalimantan ◽  
Relative Root Growth ◽  
Relative Root

Food security and sovereignty can be realized through the expansion of agricultural land to the marginal lands. One type of marginal land is acidie soils with high levels of aluminum (Al) toxicity. An efficient and environmentally friendly approach to utilizeng acidie soils as agricultural land is by using rice varieties which have a high tolerance to aluminum stress on acidie soils. The purpose of this study was to determine the effect of aluminum stress on the growth of the local rice from East Kalimantan and to select the tolerant cultivars against aluminum stress at the germination stage. The study was conducted for three months (May-July 2018), at Laboratory of Biotechnology, Faculty of Agriculture, University of Mulawarman, Samarinda.  This study used a Split Plot Design with three replications. As the main plot was Aluminum stress concentration (A) consisting of 3 levels, namely 0, 250 and 500 ppm of AlCl3 and as subplots were 25 rice genotypes, consisting of 23 local rice cultivars from East Kalimantan (V) and two genotypes as tolerant (Mekongga) and sensitive (IR64) controls. Assessment of aluminum tolerance level was carried out by calculating plant sensitivity index values against aluminum stress based on the Relative Root Growth (RRG) and Relative Shoot Growth (SRG) parameters. Other plant growth parameter data, root and shoot fresh and dry weight, were analyzed using analysis of variance at the test level α = 0.05, and the post-hoch test using Honestly Significant Difference test (HSD). Aluminum stress caused disruption of the East Kalimantan local rice cultivars growth, especially root growth. Aluminum concentration at either 250 ppm or 500 ppm reduced relative root growth and further damage the root system of the rice plants causing roots stunted and thickened. Likewise with shoot growth parameter, there was a relative shoot growth decline due to the aluminum stress on the plants. Two local rice cultivars of East Kalimantan, Pulut Mayang and Pulut Linjuang, were consistently tolerant to aluminum stress either in 250 ppm or 500 ppm of AlCl3; while Kawit, Bentian, Mayas Putih and Ketan putih cultivars were only classified as tolerant at a concentration of 250 ppm aluminum. On the other hand, a control sensitive variety IR64 showed the susceptibility to 250 and 500 ppm aluminum stress.

Influence of aluminum stress on shoot and root growth of contrasting genotypes of coleus

1997 ◽  
Vol 20 (9) ◽  
pp. 1045-1060 ◽  
Author(s):  
Donald T. Krizek ◽  
Charles D. Foy ◽  
Roman M. Mirecki
Keyword(s):  
Root Growth ◽  
Aluminum Stress ◽  
Shoot And Root Growth

scholarly journals The critical period of aluminum stress on soybean root growth

2020 ◽  
Vol 1 (1) ◽  
pp. 21
Author(s):  
Danner Sagala ◽  
Eka Suzanna ◽  
Prihanani Prihanani
Keyword(s):  
Root Growth ◽  
Critical Threshold ◽  
Aluminum Stress ◽  
Considerable Effort ◽  
Aluminum Exposure ◽  
Soybean Root ◽  
Soybean Seedlings ◽  
Soybean Roots ◽  
Tidal Swamps ◽  
The Impact

Aluminum is prevalent in soils of tidal swamps. Soybean is known to be very sensitive to aluminum stress and so when tidal swamps are converted to soybean cropland, considerable effort and expense are required to overcome Al toxicity in soybean roots. It is therefore necessary to determine at what time in early development soybeans can best endure aluminum stress and identify aluminum-tolerant cultivars. This study was conducted by testing the impact of aluminum exposure on three soybean cultivars (Tanggamus, Karasumame, and M652) (relative to no-exposure controls) at four time periods at 10, 20, and 30 days after planting. No significant effect of aluminum on root growth in the first five days after exposure was observed, but the toxic effects became evident after soybeans had been exposed to aluminum for 10 days. Soybean seedlings that experienced aluminum stress earliest (at 10 days after planting) were more negatively impacted by Al exposure than seedlings exposed later (e.g., 30 days after planting). Root growths of the three cultivars we tested in this study were all detrimentally impacted by aluminum exposure. However, the M652 cultivar was the most sensitive to aluminum exposure. We conclude that the critical threshold period for soybean root growth to succumb to aluminum stress is within the first 30 days after planting, whereas the tolerance to aluminum stress occurs only during the first 10 days of exposure.

Salicylic Acid Counteracts Aluminum Stress-induced Growth and Biomass Yield Reduction in Medicago sativa L.

2019 ◽  
Vol 39 (3) ◽  
pp. 153-157
Author(s):  
Md. Atikur Rahman ◽  
Sang-Hoon Lee ◽  
Yowook Song ◽  
Hee Jung Ji ◽  
Ki-Yong Kim ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Medicago Sativa ◽  
Biomass Yield ◽  
Yield Reduction ◽  
Aluminum Stress
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