“…The modulation of auxin in response to abiotic changes in the environment is heavily documented, including a well-studied role for auxin in tropic responses to gravity (Morita and Tasaka 2004) and light (Holland et al 2009), a connection between auxin and response to salt stress (Wang et al 2009), and an interaction between auxin and high temperature (Gray et al 1998;Koini et al 2009). Just as the distribution of money by the government is affected by lobbyists and special interest groups, the developmental program is strongly influenced by information from the abiotic environment.…”
“…The modulation of auxin in response to abiotic changes in the environment is heavily documented, including a well-studied role for auxin in tropic responses to gravity (Morita and Tasaka 2004) and light (Holland et al 2009), a connection between auxin and response to salt stress (Wang et al 2009), and an interaction between auxin and high temperature (Gray et al 1998;Koini et al 2009). Just as the distribution of money by the government is affected by lobbyists and special interest groups, the developmental program is strongly influenced by information from the abiotic environment.…”
“…These results indicated the involvement of AUX1, TIR1 and AXR1 in mediating increased salt tolerance conferred by V. dahliae VCs, with AUX1 playing a key role. It was reported that under high salt, the inhibition of lateral root formation is caused by suppression of basipetal auxin transport, resulting in over-accumulation of auxin in root epidermis of elongation zone while depleting auxin in root apex (Wang et al 2009). AUX1 encodes a non-redundant auxin influx carrier (Marchant 1999), which facilitates auxin distribution in lateral root cap and elongation of epidermal cells (Marchant et al 2002; Band et al 2014).…”
Section: Resultsmentioning
confidence: 99%
“…AUX1 encodes a non-redundant auxin influx carrier (Marchant 1999), which facilitates auxin distribution in lateral root cap and elongation of epidermal cells (Marchant et al 2002; Band et al 2014). The aux1-7 mutant exhibited higher susceptibility to salt stress than the wild type, suggesting that auxin transport is required for alleviating salt stress (Wang et al 2009; Galvan-Ampudia and Testerink 2011). 10.1080/21501203.2018.1448009-F0002Figure 2.Growth responses of A. thaliana auxin signalling mutants to V. dahliae VCs in the presence of NaCl.…”
Volatile compounds (VCs) produced by diverse microbes seem to affect plant growth, development and/or stress tolerance. We investigated how VCs released by soilborne fungi Fusarium oxysporum and Verticillium dahliae affect Arabidopsis thaliana responses to abiotic and biotic stresses. Under salt stress, VCs from both fungi helped its growth and increased chlorophyll content. However, in contrast to wild-type A. thaliana (Col-0), V. dahliae VCs failed to increase leaf surface area in auxin signalling mutants aux1-7, tir1-1 and axr1-3. Compared to wild-type Col-0, the degree of lateral root density enhanced by V. dahliae VCs in these mutants was also reduced. Consistent with the involvement of auxin signalling in fungal VC-mediated salt torelance, A. thaliana line carrying DR5::GUS displayed increased auxin accumulation in root apex upon exposure to V. dahliae VCs, and 1-naphthylphthalamic acid, an auxin transport inhibitor, adversely affected V. dahliae VC-mediated salt tolerance. F. oxysporum VCs induced the expression of PR1 but not PDF1.2 in A. thaliana lines containing PR1::GUS and PFD1.2::GUS. When challenged with Pseudomonas syringae after the exposure to F. oxysporum VCs, A. thaliana showed reduced disease symptoms. However, the number of bacterial cells in F. oxysporum VC-treated plants was not significantly different from that in control plants.
“…Castroluna et al (2014) reported that increasing salt concentrations until certain point increased radicle length and decreased it at 100 mM and then increased again at 200 mM NaCl in Salina variety of alfalfa. Primary root system of alfalfa exposed directly to NaCl treatment prevented the root growth by depressing the cell enlargement and cycle of cell (Wang et al 2009). At the same time, the root hairs lose their activities and then disappear depending an increasig levels of NaCl (Ali et al 1999).…”
This study was conducted to determine the responses of some alfalfa varieties to different salt concentrations at germination stage. Alfalfa varieties Bilensoy-80, Alsancak, Gozlu-1, Prosementi and Iside were used as plant materials. Salt concentrations were composed of five levels of NaCl such as 0, 50, 100, 150 and 200 mM. In the experiment, some characters such as germination percentage, plumule length, radicle length, dry weights of plumule and radicle were examined. Results indicated that the salt concentrations above 100 mM had negative effects on germination percentage and dry weights of plumule and radicle. The endurances of varieties to salt stress indicated differences in respect of all components examined. In addition, the effects of variety x salt interactions were significant for lengths of plumule and radicle and plumule dry weight. There were no plumule development in varieties of especially Bilensoy-80, Gozlu-1 and Iside at 200 mM salt level of NaCl. As a brief, the variety Alsancak had been more endurance than the other varieties in experiment.
Key words: Alfalfa, Germination percentage, Salt stress
Farklı Yonca Çeşitlerinin Çimlenme Döneminde Tuz Stresine Tepkilerinin BelirlenmesiÖzet: Bu çalışma, bazı yonca çeşitlerinin çimlenme döneminde farklı tuz konsantrasyonlarına tepkilerinin belirlenmesi amacıyla laboratuvar koşullarında yapılmıştır. Araştırmada bitki materyali olarak Bilensoy, Alsancak, Gözlü, Prosementi ve İside çeşitleri kullanılmıştır. Araştırmada beş farklı NaCl dozu (0, 50, 100, 150 ve 200 mM) ele alınmıştır. Araştırmada çimlenme yüzdesi, sapçık uzunluğu, kökçük uzunluğu, sapçık ve kökçük kuru ağırlıkları gibi özellikler incelenmiştir. Elde edilen sonuçlar çimlenme yüzdesi, sapçık ve kökçük kuru ağırlığında 100 mM NaCl üzerindeki dozlarda olumsuz etkilerin ortaya çıktığını göstermektedir. Çeşitler arasında incelenen tüm özellikler açısından önemli farklılıklar ortaya çıkmıştır. Ayrıca, çeşit x tuz interaksiyonu sapçık ve kökçük uzunluğu ile sapçık kuru ağırlığı açısından önemli çıkmıştır. Araştırmada ele alınan çeşitlerden özellikle Bilensoy-80, Gözlü-1 ve İside çeşitlerinde 200 mM NaCl dozunda sapçık gelişimi olmamıştır. Ele alınan özellikler açısından genel olarak değerlendirildiğinde Alsancak çeşidi çimlenme döneminde tuza dayanım yönünden diğerlerine oranla daha dayanıklı olmuştur.
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