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| Fabbri,Liliana Teresa; Ploschuk,Edmundo Leonardo; López,María Virginia; Insausti,Pedro; Rua,Gabriel Hugo. |
| Morphological and physiological responses to freezing were evaluated in two ecotypes of the perennial turfgrass Paspalum vaginatum. Leaf extension rate, number of active meristems, leaf water potential and net photosynthesis were measured on plants of both a commercial cultivar, 'Sea Isle 2000', and a wild ecotype from the Flooding Pampa grasslands of Argentina. Plants were propagated by cloning, cultivated in pots, and examined during 18 consecutive days under two treatments: a non-frozen control treatment (15.5±7 ºC) and a frozen treatment with two stages: Stage 1 with four hours of freezing stress for 10 nights (-5ºC), and Stage 2 with 12 hours of freezing stress for eight nights (five nights at -5ºC and three nights at -8ºC). After these treatments,... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Freezing tolerance; Leaf water potential; Meristem injury; Paspalum vaginatum; Photosynthesis; Seashore paspalum; Turfgrass. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000100152 |
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| RADA,FERMÍN; BRICEÑO,BENITO; AZÓCAR,AURA. |
| Temperature determines plant formations and species distribution along altitudinal gradients. Plants in the tropical high Andes, through different physiological and morphological characteristics, respond to freezing night temperatures and high daytime energy inputs which occur anytime of the year. The main objective of this study was to characterize day and night temperature related responses of two Lupinus species with different altitudinal ranges (L. meridanus, 1,800-3,600 and L. eromonomos, 3,700-4,300 m of altitude). Are there differences in night low temperature resistance mechanisms between the species along the gradient? How do these species respond, in terms of optimum temperature for photosynthesis, to increasing altitude? Lupinus meridanus shows... |
| Tipo: Journal article |
Palavras-chave: Lupinus meridanus; Lupinus eromonomos; Frost avoidance; Freezing tolerance; Optimum temperature for photosynthesis. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000300003 |
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| Vendrame,Wagner; Faria,Ricardo Tadeu de; Sorace,Mauren; Sahyun,Sandra Aparecida. |
| Orchids are lush and highly valuable plants due to their diversity and the beauty of their flowers, which increases their commercialization. The family Orchidaceae comprises approximately 35,000 species, distributed among more than 1,000 distinct genera and 100,000 hybrids, totaling approximately 8% to 10% of all flowering plants. With the advance of agriculture and the constant destruction of their natural habitat, orchid species are collected in an indiscriminate manner by collectors and vendors, and this extractive activity threatens many species with extinction, drastically reducing their genetic variability in nature. Therefore, it is essential to seek alternatives that make the preservation of such species feasible using techniques with low... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Preservation; Orchidaceae; Ex situ conservation; Freezing tolerance; Extinction. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542014000300001 |
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| Shu,Yongjun; Li,Wei; Zhao,Jinyue; Zhang,Sijia; Xu,Hanyun; Liu,Ying; Guo,Changhong. |
| Abstract Alfalfa (Medicago sativa L.) is an important perennial forage, with high nutritional value, which is widely grown in the world. Because of low freezing tolerance, its distribution and production are threatened and limited by winter weather. To understand the complex regulation mechanisms of freezing tolerance in alfalfa, we performed transcriptome sequencing analysis under cold (4 °C) and freezing (-8 °C) stresses. More than 66 million reads were generated, and we identified 5767 transcripts differentially expressed in response to cold and/or freezing stresses. These results showed that these genes were mainly classified as response to stress, transcription regulation, hormone signaling pathway, antioxidant, nodule morphogenesis, etc., implying... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Medicago sativa L.; RNA-seq; Freezing tolerance; C-repeat binding factors (CBF). |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000500824 |
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