Cotton genotypic variation in the photosynthetic response to irradiance

Pettigrew, William T.

doi:10.1007/s11099-005-0014-1

Cited by 22 publications

(22 citation statements)

References 11 publications

(15 reference statements)

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“…The okra leaf genotypes did have 14% greater FЈ v /FЈ m across treatments when compared to the normal leaf cottons. Higher photosynthetic rates per unit leaf area have been observed in okra leaf genotypes (Pettigrew 2004a). Colom and Vazzana (2002) used chlorophyll Xuorescence to clarify the ability of weeping lovegrass, Eragrostis curvula to grow and produce under drought stress.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of chlorophyll fluorescence as a tool for the identification of drought tolerance in upland cotton

et al. 2008

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Chlorophyll Xuorescence (CF) is one tool used by researchers to quantify plant water status during periods of limited water availability. The research reported herein was designed to evaluate a CF-based protocol as a tool for use in cotton, Gossypium spp. breeding programs for the identiWcation of drought tolerant genotypes. Twenty genotypes were selected to represent diverse and distinct US germplasm pools. Replicated tests were performed in Lubbock and College Station, TX in 2006 and 2007. Dryland and irrigated treatments, as main plots, were applied in a randomized complete block design, split to genotypes. CF measurements were taken at mid-bloom and late bloom growth stages. Source leaf tissue was harvested at predawn and subjected to high temperature incubation with CF measurements subsequently taken hourly for 5 h. Drought stressed plants had not mobilized their carbohydrate reserves from their source leaves overnight and thus maintained cell viability and therefore higher CF values throughout the incubation and measurement period with the opposite being true for non-stressed plants. Fiber lint yield and Wber properties were measured for comparison with the CF data. Genotype £ treatment eVects complicated the classiWcation of genotypic response to drought. Few and inconsistent correlations were found among CF values and lint yield or Wber properties. Data suggested that this procedure provides little potential in selecting plants for drought tolerance when plants are grown under Weld culture.

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Section: Introductionmentioning

confidence: 99%

Evaluation of chlorophyll fluorescence as a tool for the identification of drought tolerance in upland cotton

et al. 2008

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“…2A). The response of P N to PAR followed an asymptotic or exponential model-like curve, typical of C 3 plants (Pettigrew 2004). P N increased fastly with PAR up to 700 to 800 μmol m -2 s -1 , but the complete saturation was not reached at 1 500 mol m -2 s -1 , as it has been observed before (Zeng et al 2012).…”

Section: Resultsmentioning

confidence: 67%

“…On cloudy days, frequent in cotton growing regions in the tropics, sugar depletion results in abscission of reproductive structures and eventually in yield loss (Wells 2011). In addition to shading, leaf aging decreases the photosynthetic capacity, e.g., due to a modification in the number and size of chloroplasts (Pettigrew 2004). Furthermore, the decrease in P N with leaf aging is significantly correlated with a decrease in free indole-3 acetic acid (Guinn and Brummett 1993), the content of chlorophyll and soluble proteins, and Rubisco activity (Wells 1988).…”

Section: Introductionmentioning

confidence: 99%

Cotton leaf gas exchange responses to irradiance and leaf aging

Echer¹,

Rosolem²

2015

Biologia plant.

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Cotton (Gossypium hirsutum L.) net photosynthetic rate (P N ) decreased with leaf age and low irradiance, and the interaction of these factors might lead to decreased yields mainly in crops with a high plant density. Shade decreased leaf gas exchange, mainly in young leaves, which did not recover after exposure to increasing irradiance. Old leaves reached P N saturation at a lower irradiance than young leaves. Also stomatal conductance decreased with leaf age and shading. Intercellular CO 2 concentration and irradiance were inversely related. The responses of P N to irradiance decreased as leaf aged, and it did not interact with shade suggesting that self-shading is not primarily responsible for the decreased photosynthetic rate in older cotton leaves.

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“…Fotosintesis kanopi lebih berpengaruh terhadap hasil akhir dibanding fotosintesis daun tunggal. Meningkatnya fotosintesis daun tunggal pada daun okra disebabkan oleh tingkat serapan CO 2 /luas daun lebih tinggi dengan meningkatnya kandungan klorofil (Pettigrew 2004).…”

Section: Hasil Dan Pembahasanunclassified

Kesesuaian Galur-Galur Harapan Kapas Berdaun Okra dalam Sistem Tumpang Sari Dengan Kedelai

Riajaya¹,

Kadarwati²

2016

Bul. Tan. Tembakau, Serat & Minyak Industri

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ABSTRAKGalur-galur kapas berdaun okra atau menjari berpotensiuntuk ditanam pada tata tanam rapat dalam sistem tumpangsari dengan palawija karena bentuk daun yang menjari dapat meneruskan intersepsi cahaya ke cabang bagian bawah, namun kesesuaiannya perlu diteliti. Penelitian lapang dilakukan di Kebun Percobaan Karangploso, Malang mulai AprilsampaiSeptember 2011 bertujuan untuk mendapatkan galur-galur kapas berdaun okra yang sesuai pada sistem tumpang sari dengan kedelai. Bahan tanaman yang digunakan adalah 4 galur harapan kapas berdaun okra dan 2 varietas kapas berdaun normal terdiri atas 98031/1/7, 98039/6, 98040/3, 98048/2, Kanesia 8, dan Kanesia 10. Galur-galur kapas tersebut tahan terhadap hama penggerek buah dan mempunyai tingkat produktivitas yang tinggi. Penelitian disusun dalam rancangan acak kelompok yang diulang tiga kali. Monokultur kapas dan kedelai ditanam untuk menghitung penurunan produksi tumpang sari terhadap monokultur dan menghitung Nilai Kesetaraan Lahan (NKL). Parameter yang diamati pada tanaman kapas adalah tinggi tanaman, lebar kanopi, jumlah cabang vegetatif dan generatif, serta jumlah buah/ tanaman setiap dua minggu mulai 60-120 HST. Bobot buah, jumlah buah terpanen, hasil kapas berbiji, dan hasil kedelai diamati saat panen. Parameter pertumbuhan yang diamati pada jagung maupun kedelai adalah tinggi tanaman dan lebar kanopi. Hasil penelitian menunjukkan galur kapas berdaun okra yaitu galur 98048/2 mempunyai kesesuaian yang tinggi bila ditumpangsarikan dengan kedelai dengan hasil kapas 1.888 kg/ha dan kedelai 1.492 kg/ha, dengan 67,3% dari potensi hasil galur tersebut dan NKL 1,3. Tingkat penurunan hasil kapas dan kedelai masing-masing 33% dan 39% terhadap monokultur. Hasil kapas monokultur galur 98048/2 tertinggi dibanding galur okra lainnya yaitu 2.837 kg/ha, dengan 101,1% dari potensi hasil galur tersebut. Penurunan hasil kedelai lebih tinggi (45-47%) bila ditumpangsarikan dengan kapas berdaun normal dibanding galur okra (36-44%).Kata kunci: Tumpang sari, kapas, kedelai, daun okra ABSTRACTCotton lines with okra-leaves may have a potential yield increase in intercropping systems, yet the compatibility of these cotton okra lines have not been quantified. Field research was conducted in Malang (East Java) from April to September 2011. The purpose of this study was to test the suitability of cotton lines with okraleaves in intercropping systems with soybean. The plant material used was 4 cotton lines of okra leaves and 2 normal leaf cotton varieties. The cotton tested were: 98031/1/7, 98039/6, 98040/3, 98048/2, Kanesia 8, and Kanesia 10. The experiment was arranged in a randomized block design with three replications. Parameters observed in the cotton plant were the plant height, canopy width, number of monopodial and simpodial branches, as well as the number of boll per plant every two weeks from 60-120 days after planting. Boll weight, harvested boll number, the cotton seed, soybean yield were observed at harvest. The soybean parameters observed were crop height and canopy width. The res...

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Cotton genotypic variation in the photosynthetic response to irradiance

Cited by 22 publications

References 11 publications

Evaluation of chlorophyll fluorescence as a tool for the identification of drought tolerance in upland cotton

Evaluation of chlorophyll fluorescence as a tool for the identification of drought tolerance in upland cotton

Cotton leaf gas exchange responses to irradiance and leaf aging

Kesesuaian Galur-Galur Harapan Kapas Berdaun Okra dalam Sistem Tumpang Sari Dengan Kedelai

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