Relationship between Photosynthetic Rate and Stomatal Conductance, Intercellular CO2 Concentration, Transpiration Rate, Vapour Pressure Deficit and Photosynthetically Active Radiation in Sweet Corn (Zea mays)

2020 ◽  
Vol 1 (2) ◽  
Author(s):  
Aidee Kamal Khamis ◽  
◽  
Umi Aisah Asli ◽  
Mohd Nadzreen Hidaya Sarjuni ◽  
Mohd Azlan Jalal ◽  
...  
Keyword(s):  
Zea Mays ◽  
Stomatal Conductance ◽  
Photosynthetic Rate ◽  
Transpiration Rate ◽  
Photosynthetically Active Radiation ◽  
Vapour Pressure ◽  
Sweet Corn ◽  
Vapour Pressure Deficit ◽  
Active Radiation ◽  
Development Stages

Sweet corn (Zea mays) is thethird-largest plantation crop in Malaysia. Since it is cultivated mainly for the corncobs, the reproductive and kernel development stages are critical for high yields. Photosynthesis measurement can be used as a major approach to improve photosynthetic efficiency, which can directly affect yield. Additionally, plant nutrient uptake also plays a major role in yield quantity and quality. Conventional fertilisation(chemical and/or organic) may result in excessive fertilizer input, which is detrimental to the environment. We therefore investigated the relationship between photosynthetic rate and stomatal conductance (gs), intercellular CO2concentration (Ci), transpiration rate and vapour pressure deficit based on leaf temperature (VpdL) and photosynthetically active radiation (PAR) during the growth and development stages of sweet corn. The seeds were subjected to the germination test to assess viability and were then planted at a distance of 10 cm both between plantsand rows (replicates). A total of eight subplots (2.2 m long, 60 cm wide, 30 cm high) were prepared in a randomized complete block design (RCBD). Leaf gas exchange measurements were carried out at days 10, 20, 30, 40, 50 and 60 at 9:00 a.m. in the morning and 4:00 p.m. in the evening. Three uniform plants were selected from each replicate and used for measurements throughout the experiment. At day 30, photosynthesis started to decline and was largely unaffected by the set environmental conditions, although stomatal conductance remained high. This can be attributed to the energy diversion from vegetative stages to reproductive stages. Therefore, fertilising practices should be synchronised to match the plant stages for more sustainable and efficient fertilisation and to obtain maximum yield.

Gas exchange processes of yellow-cedar (Chamaecyparis nootkatensis) in response to environmental variables

1991 ◽  
Vol 69 (12) ◽  
pp. 2684-2691 ◽  
Author(s):  
Steven C. Grossnickle ◽  
John H. Russell
Keyword(s):  
Stomatal Conductance ◽  
Response Surface ◽  
Photosynthetically Active Radiation ◽  
Vapour Pressure ◽  
Vapour Pressure Deficit ◽  
Surface Model ◽  
Root Temperature ◽  
Active Radiation ◽  
Chamaecyparis Nootkatensis ◽  
Exchange Processes

Yellow-cedar (Chamaecyparis nootkatensis (D. Don) Spach) gas exchange processes were measured in response to the following primary environmental variables: photosynthetically active radiation, vapour pressure deficit, root temperature, and soil moisture. Under nonlimiting edaphic conditions, maximum stomatal conductance and maximum CO2 assimilation increased rapidly as photosynthetically active radiation increased from 0 to 200 μmol∙m−2∙s−1 and from 0 to 500 μmol∙m−2∙s−1, respectively. Thereafter, greater photosynthetically active radiation levels only resulted in minor increases in stomatal conductance and CO2 assimilation. Maximum stomatal conductance and maximum CO2 assimilation declined in a concave manner as vapour pressure deficit increased from 1 to 5 kPa. Response surface model for stomatal conductance showed vapour pressure deficit was the primary influence after light had caused initial stomatal opening. Response surface modeling approach showed CO2 assimilation increased as photosynthetically active radiation increased, but increased vapour pressure deficit resulted in a suppression of CO2 assimilation. Response surface model showed internal CO2 concentration declined sharply as photosynthetically active radiation increased from 0 to 500 μmol∙m−2∙s−1, but it remained constant with increasing vapour pressure deficit. Decreasing root temperature resulted in a continual decline in CO2 assimilation and stomatal conductance from 22 to 1 °C, while internal CO2 concentration declined from 22 to 13 °C with little change between 13 and 1 °C. As predawn shoot water potential decreased from −0.5 to −2.0 MPa, CO2 assimilation declined in a linear manner, while stomatal conductance and internal CO2 concentration declined in a concave manner. Key words: Chamaecyparis nootkatensis, CO2 assimilation, stomatal conductance, internal CO2 concentration, photosynthetically active radiation, vapour pressure deficit, root temperature, predawn shoot water potential.

scholarly journals TRANSPIRAÇÃO FOLIAR E CONDUTÂNCIA ESTOMÁTICA DA CANA-DE-AÇÚCAR EM FUNÇÃO DO CLIMA E DISPONIBILIDADE DE ÁGUA

Irriga ◽  
2017 ◽  
Vol 22 (4) ◽  
pp. 675-689
Author(s):  
Gustavo Cavalari Barboza ◽  
José Teixeira Filho
Keyword(s):  
Stomatal Conductance ◽  
Water Potential ◽  
Photosynthetically Active Radiation ◽  
Vapour Pressure Deficit ◽  
Weather Conditions ◽  
Gas Analyzer ◽  
Active Radiation ◽  
Agricultural Engineering ◽  
Leaf Transpiration ◽  
Infrared Gas Analyzer

TRANSPIRAÇÃO FOLIAR E CONDUTÂNCIA ESTOMÁTICA DA CANA-DE-AÇÚCAR EM FUNÇÃO DO CLIMA E DISPONIBILIDADE DE ÁGUA  GUSTAVO CAVALARI BARBOZA¹ E JOSÉ TEIXEIRA FILHO² ¹ Faculdade de Engenharia Agrícola, UNICAMP – Universidade Estadual de Campinas, Cidade Universitária Zeferino Vaz, Campinas- SP – Brasil. CEP:13083-875, [email protected]. ² Faculdade de Engenharia Agrícola, UNICAMP – Universidade Estadual de Campinas, Cidade Universitária Zeferino Vaz, Campinas- SP – Brasil. CEP:13083-875, [email protected].  1 RESUMO Diversos trabalhos utilizam da porometria como metodologia para quantificar a transferência de água para a atmosfera. No entanto, para a cana-de-açúcar essa metodologia é escassa. Assim, o objetivo do trabalho foi verificar o comportamento da transpiração foliar (E) e da condutância estomática (Gs) da cana-de-açúcar em função da radiação fotossinteticamente ativa (PAR) e do deficit de pressão de vapor (DPV), e correlacionar com os diferentes potenciais hídricos das plantas (Ψpd). Esse experimento foi conduzido na área experimental da Faculdade de Engenharia Agrícola da Universidade Estadual de Campinas, no qual foi instalada uma parcela de cana-de-açúcar, variedade RB867515 e utilizado o analisador automático de fotossíntese - IRGA LI6400XT, na escala horária. A partir dos resultados, conclui-se que os valores de E e Gs estão correlacionados positivamente com as condições meteorológicas e também com a disponibilidade de água no solo. Palavras-chave: Trocas gasosas, potencial hídrico foliar, radiação fotossinteticamente ativa.  BARBOZA, G. C.; TEIXEIRA FILHO, J.LEAF TRANSPIRATION AND STOMATAL CONDUCTANCE OF SUGARCANE IN FUNCTION OF WEATHER AND AVAILABILITY OF WATER  2 ABSTRACT There are several studies using porometry as method to quantify the transfer of water to the atmosphere. However, for sugarcane this methodology is scarce. The objective of the study was to investigate the behavior of leaf transpiration (E) and stomatal conductance (Gs) of sugarcane in function of photosynthetically active radiation (PAR) and vapour-pressure deficit (VPD), and to correlate with the different water potential of plants (Ψpd). This experiment was conducted in the experimental area of the Faculty of Agricultural Engineering/UNICAMP, where was installed a parcel of sugarcane, RB867515 variety was installed, and a infrared gas analyzer - IRGA LI6400XT was used in hourly scale. Based on the results, it is concluded that the values of E and Gs are positively correlated with the weather conditions and with the availability of water in the soil. Keywords: Gas Exchange, leaf water potential, photosynthetically active radiation.

Effects of canopy closure on photosynthetic characteristics of Ilex latifolia Thunb. in Phyllostachys pubescens forests

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Jianshuang Gao ◽  
Shunyao Zhuang ◽  
Zhuangzhuang Qian
Keyword(s):  
Net Photosynthetic Rate ◽  
Photosynthetic Rate ◽  
Transpiration Rate ◽  
Photosynthetically Active Radiation ◽  
Great Influence ◽  
Light Response ◽  
Photosynthetic Characteristics ◽  
Phyllostachys Pubescens ◽  
Canopy Closure ◽  
Active Radiation

Plantation under the forest is a good way of agroforestry, but the canopy closure has a great influence on understory herbs’ growth. In the study, different canopy closures of Phyllostachys pubescens forests were set up to explore its influence on the growth of Ilex latifolia Thunb. The photosynthetic characteristics of Ilex latifolia leaves under different canopy closures were determined by Li-6400 portable photosynthetic system. The results showed that the net photosynthetic rate curve of Ilex latifolia leaves of T1 (canopy closure of 0.56) was bimodal with an obvious "midday depression" phenomenon, while the net photosynthetic rate curves of T2 (canopy closure of 0.72) and T3 (canopy closure of 0.86) were unimodal. The results of light response curve showed that the photosynthetically active radiation and transpiration rate reduced with the increasing of canopy closures. The photosynthetically active radiation, transpiration rate, stomatal conductance, and net photosynthetic rate of Ilex latifolia leaves of T2 were higher than those of T3. Although the net photosynthetic rate of T2 was lower than that of T1, it had no obvious photo-inhibition which affected plant growth. Overall, the canopy closure of 0.72 was more suitable for the growth of Ilex latifolia. The herb plantation in the bamboo forest should be considered with the canopy closure for a better growth.

scholarly journals Leaf Temperature and Vapour Pressure Deficit (VPD) Driving Stomatal Conductance and Biochemical Processes of Leaf Photosynthetic Rate in a Subtropical Evergreen Coniferous Plantation

2018 ◽  
Vol 10 (11) ◽  
pp. 4063 ◽  
Author(s):  
Yue Li ◽  
Lei Zhou ◽  
Shaoqiang Wang ◽  
Yonggang Chi ◽  
Jinghua Chen
Keyword(s):  
Stomatal Conductance ◽  
Photosynthetic Rate ◽  
Vapour Pressure Deficit ◽  
Leaf Temperature ◽  
Slash Pine ◽  
Seasonal Patterns ◽  
Subtropical China ◽  
Biochemical Processes ◽  
Leaf Photosynthetic Rate ◽  
Positive Effect

Photosynthesis is arguably the most important biochemical process on Earth, which is dramatically influenced by environmental conditions. How environmental factors drive stomatal conductance and biochemical processes of leaf photosynthetic rate has not been sufficiently investigated in subtropical China. In this study, we analysed the effects of stomatal and biochemical parameters on the photosynthetic rate of native Masson’s pine (Pinus massoniana Lamb.) and exotic slash pine (Pinus elliottii Engelm.) in response to leaf temperature and vapour pressure deficit (VPD) in subtropical China, based on leaf gas exchange measurements in 2016. Our results showed that there was no significant difference in the light-saturated photosynthetic rate (Asat) between native Masson’s pine and exotic slash pine. The seasonal patterns of maximum rate of the carboxylation (Vcmax25) were basically consistent with seasonal patterns of Asat for both species. The positive effect of leaf temperature on Asat was mainly produced through its positive effect on Vcmax25. Leaf temperature had no significant effect on stomatal conductance. Vcmax25 and gs simultaneously affected Asat in response to VPD. Our results highlighted the importance of biochemical processes in limiting leaf photosynthetic rate in response to environmental conditions in subtropical evergreen coniferous plantations.

scholarly journals Response of in vitro Cultured Palm Oil Seedling Under Saline Condition to Elevated Carbon Dioxide and Photosynthetic Photon Flux Density

2012 ◽  
pp. 52-64
Author(s):  
Pet Roey Pascual ◽  
Krienkai Mosaleeyanon ◽  
Kanokwan Romyanon ◽  
Chalermpol Kirdmanee
Keyword(s):  
Stomatal Conductance ◽  
Net Photosynthetic Rate ◽  
Elevated Co2 ◽  
Photosynthetic Rate ◽  
Transpiration Rate ◽  
Pigment Contents ◽  
Salinity Levels ◽  
Oil Palms ◽  
Ambient Co2

Salt stress elicits various physiological and growth responses of oil palm. A laboratory experiment was conducted to determine the responses of oil palms cultured in vitro under varying salinity levels (0, 85.5, 171.11, 342.21 and 684.43 mM NaCl) to elevated CO2 (1000 μmol CO2/mol) and PPFD (100±5 μmol m-2s-1) in terms of growth characteristics, pigment contents and photosynthetic abilities. After 14 days of culture, net photosynthetic rate (μmol CO2 m-2s-1) of oil palms across varying salinity levels was 5.33 times higher than those cultured under ambient CO, (380±100 Mmol CO2/mol) and PPFD (50±5 μmol m-2s -1). At increased net photosynthetic rate (elevated CO2 and PPFD), despite having no significant difference in pigment contents (chlorophyll a, chlorophyll b, total chlorophyll and carotenoid) between different CO2 and PPFD levels, dry weight and percent dry matter were 0.26 and 0.11 times higher, respectively, as compared to those cultured under ambient CO2 and PPFD. In the same elevated CO2 and PPFD level, across all salinity levels, stomatal conductance was 0.30 times lower than those cultured under ambient CO2 and PPFD. At reduced stomatal conductance (elevated CO2 and PPFD), transpiration rate was also reduced by 0.30 times. Thus with increased net photosynthetic rate and reduced transpiration rate, water use efficiency was increased by 7.22 times, across all salinity levels, than those cultured at ambient CO2 and PPFD. These were considered essential for NaCl produces iso-osmotic stress.

scholarly journals Patatesin Kısa Süreli Kuraklık Uygulamasına Fizyolojik Tepkileri

2016 ◽  
Vol 4 (7) ◽  
pp. 618
Author(s):  
İlknur Tındaş ◽  
Ufuk Demirel
Keyword(s):  
Stomatal Conductance ◽  
Photosynthetic Rate ◽  
Transpiration Rate ◽  
Tuber Yield ◽  
Russet Burbank ◽  
Significant Decline ◽  
Proline Content ◽  
Drought Treatment ◽  
H2o2 Accumulation ◽  
Tuber Bulking

The study aimed to identify physiological response of potato to drought. For this aim, a drought experiment was carried out by using two different potato varieties, cv. Desiree and Russet Burbank, under environmentally controlled greenhouse conditions. Drought treatment was initiated at 45 days after emergence (early tuber bulking period) by withholding irrigation for 10 days. Physiological traits such as stomatal conductance, transpiration rate, photosynthetic rate, chlorophyll index, leaf temperature, proline content, malondialdehyde (MDA) accumulation and hydrogen peroxide (H2O2) accumulation, in addition, some yield components average tuber weight, number of tubers and plant tuber yield were evaluated in the study. While the first significant decline in stomatal conductance, transpiration rate, and photosynthetic rate of both varieties was occurred at the 5th day of withholding irrigation, the highest decline was observed at 9th and 10th days of withholding irrigation. Proline content in both varieties increased two times at 10th day of withholding irrigation, however, H2O2 accumulation was not changed significantly by drought treatment. Even though MDA accumulation was increased in both varieties under drought stress conditions, the increase was significant in Desiree whereas, it was not significant in Russet Burbank. In addition, while drought treatment did not change the plant tuber yield in both varieties, it caused to a significant decline in average tuber yield of Russet Burbank, being an important trait for marketable tuber yield.

scholarly journals Effects of the reciprocal grafting on the photosynthesis of two genotypes tomato offspring under selenium stress

2019 ◽  
Vol 136 ◽  
pp. 07008
Author(s):  
Shiyao Shan ◽  
Huizhong Luo ◽  
Jinpeng Zhu ◽  
Zhiyu Li ◽  
Huanxiu Li
Keyword(s):  
Stomatal Conductance ◽  
Net Photosynthetic Rate ◽  
Photosynthetic Rate ◽  
Transpiration Rate ◽  
Functional Activity ◽  
Theoretical Basis ◽  
Photosynthetic Capacity ◽  
Growth Characteristics ◽  
Cherry Tomato ◽  
Fresh Weight

To study the effects of the reciprocal grafting on the photosynthesis of two genotypes tomato offspring under selenium stress, red ball cherry tomato cherry 5-5-1 and yellow ball cherry tomato yellow RTY-3-2 post-grafting generation (red scion, red rootstock, yellow scion and yellow rootstock) and seedlings (red CK and yellow CK) planted in 10 mg·kg-1 selenium soil, and the pot experiment was carried out to study the effects of the reciprocal grafting on the growth characteristics and the photosynthesis of tomato offspring under selenium stress. The results showed that grafting increased the fresh weight of the organs of the offspring, the ratio of root to shoot, and the functional activity of the roots of the plants, which was conducive to the growth of tomato offspring. Simultaneously, it could effectively improve the photosynthetic capacity of grafted offspring leaves at the seedling stage. The grafted offspring of rootstocks had the best effect on improving the net photosynthetic rate, stomatal conductance and transpiration rate and stomatal conductance of tomato leaves, and decreased intercellular CO2 concentration. Among them, the best effect of yellow rootstock was to provide ideas and theoretical basis for the production of selenium-enriched tomatoes in the selenium-deficient areas in the future.

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