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Showing 3 results for Flowering
Sequencing and phylogenetic study of APETALA1 homologous gene in garden cress (Lepidium sativum L.)
Mahboubeh Sheikhbahaei, Farkhondeh Rezanejad, Hossein-Ali Sasan,
Volume 5, Issue 4 (3-2019)
Abstract

The flowering process in plants proceeds through the induction of an inflorescence meristem triggered by several pathways. Many of the genes associated with these pathways encode transcription factors of the MADS domain family. The MADS-domain transcription factor APETALA1 (AP1) is a key regulator of flower development. The first step to understand the molecular mechanisms under the function of each gene in a plant is identification, sequencing and phylogeny analysis of that gene. For this purpose, total RNA was isolated from flower bud of garden cress (Lepidium sativum L.) and was used for cDNA synthesis. The specific primers were designed based on nucleotide sequence alignment of AP1 homologus genes from plants of the same family Brassicaceae and were used in RT-PCR. After observing its electrophoretic pattern and ensuring the quality of PCR product, the amplicon was sent for sequencing. After receiving the results of sequencing, the sequence examined with BLAST, MUSCLE, Gene Runner and MEGA6 softwares. The results indicated amplification of 787 nucleotides fragment that named LsAP1 and was recorded by accession number KP070728 in NCBI database. The studies show high similarity and overlapping of gene bank sequences with LsAP1 illative protein. According to these results, LsAP1 may play a similar role as AP1 in flower induction and could act as a flower meristem identity gene in Lepidium sativum L.


The effects of different sources of potassium and calcium on yield and ionic balance of tomatoes under salinity stress in hydroponic cultivation
Akbar Forghani, Amir Hossein Forghani, Maryam Altafi, Kazem Hashemi Majd, Omid Sofalian,
Volume 8, Issue 3 (10-2021)
Abstract
Most of agricultural lands in Iran are located in arid and semi-arid regions and are considered as saline soils. In order to investigate the interaction of salinity as well as potassium and calcium on the growth and yield of tomato plants, a factorial experiment was perfected in the form of randomized complete blocks, in hydroponic conditions, with three replicates per treatment. Experimental factors include salinity at three levels (0, 20, and 40 mM NaCl), potassium content form chloride, nitrate (0 and 15 mM), and calcium from chloride, and nitrate (with 0 and 10 mM (. The studied growth factors, including plant height, stem diameter, number of leaves, flowers and fruits and leaf chlorophyll decreased with increase NaCl. Treatment plants with Ca (NO3)2 at 40 mM NaCl, increased the shoot and root dry weight by 55% and 95%, respectively. In addition, application of Ca (NO3)2 in the medium with maximum salinity concentration resulted in an increase of 75% in chlorophyll content. The analysis of data showed that the increase of salinity was accompanied with increase sodium content level of tomato plants. However, the root potassium was observed to decrease. On the contrast to the root, potassium content showed no change in the organs from the root upwards. Also, the use of Ca (NO3)2 with 40 mM NaCl reduced Na+ content by 23% compared with plants treated only with 40 mM NaCl. According to the results, it seems that application of Ca (NO3)2 may improve chlorophyll content, dry weight, and modulate ion hemostasis and decreased the negative of salt stress in tomato plants.

The impacts of climate change and meteorological factors on pollen season indicators of allergenic plant taxa
Fateme Mousavi, Youcef Shahali, José Oteros, Karl-Christian Bergmann,
Volume 9, Issue 2 (9-2022)
Abstract
Pollen respiratory allergies have been increasing in prevalence over the last two decades, partly as the result of the impact of climate change. For many allergenic trees, grass and weed species, increased pollen production and prolonged pollination period result in long-term increased abundance of pollen allergens in the atmosphere; earlier shifts of airborne pollen grains and prolonged exposure to respiratory allergens with important health effects on allergic individuals. The aim of this review paper was to investigate the impact of climate change and meteorological factors on pollen season indicators with a special focus on the main allergenic taxa worldwide. Main variables influencing flowering phenology such as location, climatic and meteorological parameters were identified, discussed and substantiated by published literature. Temperature, solar radiation, humidity, rainfall, wind speed and direction were identified among the most important meteorological parameters affecting the fluctuations of annual concentrations of allergenic airborne pollen grains. Although notable variations were observed according to allergenic species and studied geographical areas, temperature appeared to be the most important climatic parameter affecting flowering phenology and pollen season indicators, especially in tree species. Rising carbon dioxide levels also result in increased plant biomass, increased flowering intensity and pollen production in several tree, grass and weed allergenic species. In the light of this review, there is a growing body of evidence supporting the effect of climate change on the flowering phenology and pollen season indicators of a substantial number of allergenic ornamental and invasive plant species.
 
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