Male Parent Identification of Triploid Rubber Trees (Hevea brasiliensis) and the Mechanism of 2n Gametes Formation

An investigation had been done to Tetragonula (Tetragona) sp nest at Indralaya, South Sumatra to describe the Tetragonula sp nest that use streetlight pole as nest medium during April - May 2019. Purpossive sampling is used to select the target nest. Two streetlight pole found be used by Tetragonula sp as their home. The coordinate of location, heght from ground surface, diameter of streetlight pole, air temperature and humidity, and floral species around nest, were noted. Spot coordinate are S 30 14’ 19.2498’’ and E 1040 39’ 15,3288’’ ; 1,5 m above the ground surface, 12 cm diameter pole, highest air temperature was 35 o C at daylight (April and May 2019), 80 – 90 % humidity at April-May 2019; which Switenia macrophyla, Hevea brasiliensis, Zea mays, and Citrullus lanatus floral species are planted around. Air temperature in the pole is very high, around 40 0 C during daylight.

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Expression analysis of rubber biosynthetic pathway genes in Hevea brasiliensis

Journal of Plantation Crops ◽

10.25081/jpc.2018.v46.i2.3721 ◽

2018 ◽

Vol 46 (2) ◽

Keyword(s):

Expression Analysis ◽

Hevea Brasiliensis ◽

Biosynthetic Pathway

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Manajemen Penyadapan Karet (Hevea brasiliensis Muell Arg.) Perkebunan Karet di Simalungun, Sumatera, Utara

Buletin Agrohorti ◽

10.29244/agrob.3.2.232-244 ◽

2015 ◽

Vol 3 (2) ◽

pp. 232

Author(s):

Hendra Wiguna ◽

. Supijatno

Keyword(s):

Hevea Brasiliensis

Penelitian dilaksanakan untuk mempelajari dan mengidentifikasi manajemen penyadapan tanaman karet. Kegiatan magang dilaksanakan di Perkebunan Karet Simalungun, Sumatera Utara pada tanggal 10 Februari hingga 9 Juni 2014. Manajemen penyadapan ditujukan untuk menjaga kontinuitas dan meningkatan produksi karet alam sesuai dengan umur ekonomis tanaman. Persentase populasi tanaman siap sadap rata-rata per-hanca di PT BSRE pada tahun tanam 2005 dan 2009 adalah 96.82%. Konsumsi kulit sadapan antara penyadap kelas A dan kelas B pada sistem sadap tarik ½ S d/3 dan sadap sorong ¼ S d/3 tidak berbeda nyata dan belum sesuai dengan standar penyadapan perusahaan. Faktor pendidikan dan pengalaman kerja penyadap mempengaruhi produksi cuplump pada sistem sadap tarik ½ S d/3, sedangkan faktor usia tidak mempengaruhi. Faktor pendidikan, usia, dan pengalaman kerja penyadap tidak mempengaruhi produksi cuplump pada sistem sadap sorong ¼ S d/3. Manajemen bidang sadap dan penggunaan zat stimulansia di perkebunan karet ini bersifat spesifik klon. Penyakit kering alur sadap (KAS) klon seri PB nyata lebih tinggi pada tahun tanam 2005 dibandingkan pada tahun tanam 2009, sedangkan penyakit KAS pada klon PB 330 dan DMI 35 tidak berbeda nyata pada tahun tanam sama.

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Consideraciones técnicas para el establecimiento y manejo del cultivo del caucho (Hevea brasiliensis) en la Orinoquia Colombiana

10.21930/978-958-8311-93-7 ◽

2007 ◽

Cited By ~ 1

Author(s):

Alfonso Martinez

Keyword(s):

Hevea Brasiliensis

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Physical and mechanical properties of rubberwood (Hevea brasiliensis) dyed with Lasiodiplodia theobromae

Journal of Wood Science ◽

10.1186/s10086-019-1843-z ◽

2019 ◽

Vol 65 (1) ◽

Cited By ~ 2

Author(s):

Boshi Zhao ◽

Zhiming Yu ◽

Yang Zhang ◽

Chusheng Qi

Keyword(s):

Mass Loss ◽

Water Absorption ◽

Hevea Brasiliensis ◽

Ph Value ◽

Energy Dispersive Spectrometer ◽

Physical And Mechanical Properties ◽

Blue Staining ◽

Loss Ratio ◽

Lasiodiplodia Theobromae ◽

Infrared Spectrometer

AbstractBlue staining on rubberwood (Hevea brasiliensis) is a common kind of defect. There currently exists much research focused on the prevention and control of blue staining. However, little research has been concentrated on the utilization of blue staining for green dyeing. The research conveyed in this paper primarily used Lasiodiplodia theobromae to dye rubberwood, and used scanning electron microscope (SEM), energy-dispersive spectrometer (EDS), X-ray diffraction (XRD), and fourier transform infrared spectrometer (FTIR) to analyze the commission internationale eclairage (CIE) L*a*b* value of color, the contact angle, the pH value, 24-h water absorption, mass loss ratio, and compressive strength in increments between 5 and 40 days. The results found that the color of rubberwood became darker and more uniform, and that the surface dyed with fungi can reach a super-hydrophobic state. With the increase of time, the pH value of rubberwood changed from acidic to alkaline. Furthermore, hyphae entered the wood mainly through vessels for their large pore diameter, and reduced water absorption. Mass loss ratio increased gradually between 5 and 40 days. The research in this paper concludes that the microorganism was an effective method of wood dyeing, and lays a foundation for further research.

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Male parent birds exert more effort to reproduce in two desert passerines

Avian Research ◽

10.1186/s40657-021-00273-6 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Donghui Ma ◽

Mengjie Lu ◽

Zhichang Cheng ◽

Xingnan Du ◽

Xiaoyu Zou ◽

...

Keyword(s):

Reproductive Output ◽

Female Parent ◽

Northwest China ◽

Reproductive Behaviour ◽

Male Parent ◽

Hatching Rate ◽

Feeding Rates ◽

Passerine Species ◽

Arid Desert ◽

Habitat Environment

Abstract Background Parental investment by birds is limited by the habitat environment, and a male parent increases its effort to reproduce in birds that live in high-altitude areas. Methods A study of the reproductive behaviour of the Saxaul Sparrow (Passer ammodendri) and the Isabelline Shrike (Lanius isabellinus) was carried out at the Gansu An’xi Extremely Arid Desert National Nature Reserve in northwest China to determine the reproductive input of passerine species in desert habitats. Results In Saxaul Sparrows, compared to the female parent, the male parent exhibited a significantly higher frequency of nest-defense behaviour (chirping and warning) during nesting, hatching and feeding periods. In addition, in comparison to the female parent, the male parent exhibited almost equal frequencies of nesting and incubation but fed nestlings significantly more times. Similar to the male sparrows, the feeding rates of the male Isabelline Shrikes were significantly higher than those of the females. The hatching rate and fledging rate of the Saxaul Sparrow on average in this study were 81.99 and 91.92%, respectively, while those of the shrike were 69.00 and 96.53%, respectively. Conclusions These two different passerine species living in the same desert environment exhibited the same trend in their reproductive investments. Adapting to desert environments is a strategy that may have evolved in passerines where male parent birds put more effort than females into reproduction to ensure high reproductive output.

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