Antioxidant defense and photosynthesis for non-indigenous mangrove species Sonneratia apetala and Laguncularia racemosa under NaCl stress

2013 ◽  
Vol 37 (5) ◽  
pp. 443-453
Author(s):  
Jian CHEN ◽  
Ni-Ya LI ◽  
Qiang LIU ◽  
Cai-Rong ZHONG ◽  
Min HUANG ◽  
...  
Keyword(s):  
Antioxidant Defense ◽  
Nacl Stress ◽  
Laguncularia Racemosa ◽  
Mangrove Species ◽  
Sonneratia Apetala

scholarly journals Seed Treatment with Trichoderma longibrachiatum T6 Promotes Wheat Seedling Growth under NaCl Stress Through Activating the Enzymatic and Nonenzymatic Antioxidant Defense Systems

2019 ◽  
Vol 20 (15) ◽  
pp. 3729 ◽  
Author(s):  
Shuwu Zhang ◽  
Bingliang Xu ◽  
Yantai Gan
Keyword(s):  
Salt Stress ◽  
Antioxidant Defense ◽  
Wheat Seedling ◽  
Nacl Stress ◽  
Ros Scavenging ◽  
Wheat Seedlings ◽  
Defense Systems ◽  
Antioxidant Defense Systems ◽  
Scavenging Enzymes ◽  
Different Levels

Salt stress is one of the major abiotic stresses limiting crop growth and productivity worldwide. Species of Trichoderma are widely recognized for their bio-control abilities, but little information is regarding to the ability and mechanisms of their promoting plant growth and enhancing plant tolerance to different levels of salt stress. Hence, we determined (i) the role of Trichoderma longibrachiatum T6 (TL-6) in promoting wheat (Triticum aestivum L.) seed germination and seedling growth under different levels of salt stress, and (ii) the mechanisms responsible for the enhanced tolerance of wheat to salt stress by TL-6. Wheat seeds treated with or without TL-6 were grown under different levels of salt stress in controlled environmental conditions. As such, the TL-6 treatments promoted seed germination and increased the shoot and root weights of wheat seedlings under both non-stress and salt-stress conditions. Wheat seedlings with TL-6 treatments under different levels of NaCl stress increased proline content by an average of 11%, ascorbate 15%, and glutathione 28%; and decreased the contents of malondialdehyde (MDA) by an average of 19% and hydrogen peroxide (H2O2) 13%. The TL-6 treatments induced the transcriptional level of reactive oxygen species (ROS) scavenging enzymes, leading to the increases of glutathione s-transferase (GST) by an average of 17%, glutathione peroxidase (GPX) 16%, ascorbate peroxidase (APX) 17%, glutathione reductase (GR) 18%, dehydroascorbate reductase (DHAR) 5%. Our results indicate that the beneficial strain of TL-6 effectively scavenged ROS under NaCl stress through modulating the activity of ROS scavenging enzymes, regulating the transcriptional levels of ROS scavenging enzyme gene expression, and enhancing the nonenzymatic antioxidants in wheat seedling in response to salt stress. Our present study provides a new insight into the mechanisms of TL-6 can activate the enzymatic and nonenzymatic antioxidant defense systems and enhance wheat seedling tolerance to different levels of salt stress at physiological, biochemical and molecular levels.

scholarly journals Paleoenvironment interpretation of a 1760 years B.P. old sediment in a mangrove area of the Bay of Guanabara, using pollen analysis

2006 ◽  
Vol 78 (2) ◽  
pp. 227-229 ◽  
Author(s):  
Ortrud M. Barth ◽  
Luiz E.U. São-Thiago ◽  
Marcia A. Barros
Keyword(s):  
Pollen Analysis ◽  
Rain Forest ◽  
Pollen Grains ◽  
Laguncularia Racemosa ◽  
Mangrove Species ◽  
Mangrove Area ◽  
Sandy Ground ◽  
Drilling Core ◽  
Actual Size ◽  
Avicennia Schaueriana

A sediment sample was obtained at 122 cm from the top of a drilling core in the Guapimirim mangrove, Bay of Guanabara, and analyzed using pollen analysis. This muddy core reached a sandy ground at 133 cm. 14C datation got the age of 1760 ± 50 years B.P. The most frequent pollen grains were mangrove species of Rhizophora mangle, Laguncularia racemosa and Avicennia schaueriana. "Restinga" and tropical rain forest vegetation was recognized behind the mangrove. After the last sea transgression at 2500 years B.P., the water level lowered to its actual size, allowing the installation of this mangrove.

scholarly journals Impact of various factors on in vitro investigation of rare mangrove species Sonneratia apetala Buch.-Ham. (Myrtales: Lythraceae) and Suaeda maritima (L.) Dumort (Caryophyllales: Amaranthaceae)

2016 ◽  
Vol 3 (5) ◽  
pp. 181
Author(s):  
Abdul Kader ◽  
Sankar Narayan Sinha ◽  
Parthadeb Ghosh
Keyword(s):  
Callus Formation ◽  
Monsoon Season ◽  
Gene Isolation ◽  
Nodal Segments ◽  
Mangrove Species ◽  
Sonneratia Apetala ◽  
Suaeda Maritima ◽  
In Vitro Investigation ◽  
Callus Initiation

Recent studies have showed the importance and destruction of mangroves. So their restoration through tissue culture study is urgently required because in vivo propagation is plagued with unforeseen obstacles. In vitro investigation of mangroves found to be suitable material for salt tolerant mechanism studies and anti stress gene isolation. This study describes for the first time in vitro approach for rare species Sonneratia apetala Buch.-Ham. (Myrtales: Lythraceae) and herb species Suaeda maritima (L.) Dumort (Caryophyllales: Amaranthaceae) through callus. For this investigation, as a source of explants various part (leaf, intermodal and nodal segments) of both mangroves were used. These explants were cultured in various types of media (MS, LS, WPM, X and B5) with different combination of phytohormones (2, 4-D and NAA with BAP in combination). We also examined the effect of NaCl and seasons on callus initiation and growth. The highest rate of callus formation was obtained with nodal explants in MS medium supplemented with 1.5 mg.L^-1 NAA and 0.5 mg.L^-1 BAP in combination and 1 mg.L^-1 NAA and 0.5 mg.L^-1 BAP in combination for Sonneratia apetala and Suaeda maritime, respectively. We also found that callus initiation rate and growth decreased with increasing NaCl concentration higher than 80 mM and 120 mM for Sonneratia apetala and Suaeda maritima, respectively in MS media. This study also found that monsoon season was best time for invitro investigation of mangroves. The results presented here give an insight into the development of in vitro investigation suitable for mangroves. The initiated callus could be restored in low salaine or devoid of salaine land.

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