Changes in essential oil-content and composition of ajowan ( Carum copticum L.) seeds in response to growth regulators under water stress

2018 ◽  
Vol 231 ◽  
pp. 219-226 ◽  
Author(s):  
Kazem Ghassemi-Golezani ◽  
Saeid Ghassemi ◽  
Saeid Zehtab Salmasi
Keyword(s):  
Water Stress ◽  
Essential Oil ◽  
Growth Regulators ◽  
Oil Content ◽  
Carum Copticum

Water Stress-Induced Alterations in Essential Oil Content and Composition of Sweet Basil

1992 ◽  
Vol 4 (1) ◽  
pp. 71-75 ◽  
Author(s):  
James E. Simon ◽  
Debra Reiss-Bubenheim ◽  
Robert J. Joly ◽  
Denys J. Charles
Keyword(s):  
Water Stress ◽  
Essential Oil ◽  
Oil Content ◽  
Sweet Basil

scholarly journals Effect of Water Stress on the Physiological Characteristics of Five Basil (Ocimum basilicum L.) Cultivars

Agronomy ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1029
Author(s):  
Iakovos Kalamartzis ◽  
George Menexes ◽  
Pantazis Georgiou ◽  
Christos Dordas
Keyword(s):  
Water Stress ◽  
Water Resources ◽  
Essential Oil ◽  
Water Potential ◽  
Oil Content ◽  
Physiological Characteristics ◽  
Assimilation Rate ◽  
Gas Exchange Parameters ◽  
Crop Species ◽  
Effect Of Water

Water stress in one of the most important abiotic stresses that affects the productivity of many crop species worldwide. In addition, the climate change creates new challenges for crop adaptation especially as water resources become limited and the increase in water stress becomes more pronounced even in areas where there is adequate water supply. The objective of the present study was to determine the effect of water stress on physiological characteristics of five cultivars of basil under field conditions. Water stress affected leaf temperature, dry herb yield, leaf water potential, assimilation rate and gas exchange parameters, quantum yield, instantaneous water use efficiency (WUE), and essential oil content. From the physiological characteristics water potential and assimilation rate can be used for the selection of basil cultivars tolerant to water stress. In addition, essential oil content was lower under water stress indicating that essential oil content is correlated with water availability. From the present study it is obvious that there are tolerant basil cultivars to water stress and can be found using physiological traits such as water potential and assimilation rate and can be used to save and use water more sustainable and also conserve the water resources.

scholarly journals High Irrigation Frequency and Brief Water Stress Before Harvest Enhances Essential Oil Yield of Rose-scented Geranium (Pelargonium capitatum × P. radens)

HortScience ◽  
2008 ◽  
Vol 43 (2) ◽  
pp. 500-504 ◽  
Author(s):  
Bahlebi K. Eiasu ◽  
Puffy Soundy ◽  
J. Martin Steyn
Keyword(s):  
Water Stress ◽  
Essential Oil ◽  
Oil Content ◽  
Clay Soil ◽  
Oil Yield ◽  
Growth Media ◽  
Irrigation Frequency ◽  
Sandy Clay ◽  
Herbage Yield ◽  
Essential Oil Yield

Pot experiments were conducted to investigate the effects of irrigation frequency and withholding irrigation during the week before harvesting on rose-scented geranium herbage yield and essential oil yield and composition. A factorial experiment with three irrigation frequencies (twice a day, once a day, and every second day) and two growth media (silica sand and sandy clay soil) were conducted in a tunnel. One week before harvest, irrigation was withheld for half of the pots in each treatment combination. In a glasshouse, sandy clay soil was used as growing medium, and five irrigation frequencies (everyday, everyday with 1-week irrigation withholding period, every second day, every third day, and every fourth day irrigation to pot capacity) were applied as treatments. Results showed that essential oil content (percent oil on fresh herbage weight basis) increased as the irrigation frequency decreased. Both herbage yield and essential oil yield positively responded to frequent irrigation. Thus, higher herbage and essential oil yields were obtained from the highest irrigation frequency. A 1-week stress period significantly increased total essential oil yield as well as oil content per fresh herbage weight. The results highlighted that conditions of high soil water availability followed by brief water stress just before harvesting would maximize rose-scented geranium essential oil yield. Citronellol and citronellyl formate tended to increase with an increase in the stress level, but the reverse was true for geraniol and geranyl formate. Other major essential oil components were unaffected by water stress.

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