Legumes and actinorhizal plants regulate gas permeability in their nod terjemahan - Legumes and actinorhizal plants regulate gas permeability in their nod Bahasa Indonesia Bagaimana mengatakan

Legumes and actinorhizal plants reg

Legumes and actinorhizal plants regulate gas permeability in their nodules, maintaining a level of oxygen within the nodule that can support respiration but is sufficiently low to avoid inactivation of the nitrogenase (Kuzma et al. 1993). Gas permeability increases in the light and decreases under drought or upon exposure to nitrate. The mechanism for regulating gas permeability is not yet known.

Nodules contain an oxygen-binding heme protein called leghemoglobin. Leghemoglobin is present in the cytoplasm of infected nodule cells at high concentrations (700 Min soybean nodules) and gives the nodules a pink color. The host plant produces the globin portion of leghemoglobin in response to infection by the bacteria (Marschner 1995); the bacterial symbiont produces the heme portion. Leghemoglobin has a high affinity for oxygen (aK of about 0.01 µM), about ten times higher than the ß chain of human hemoglobin.

Although leghemoglobin was once thought to provide a buffer for nodule oxygen, recent studies indicate that it stores only enough oxygen to support nodule respiration for a few seconds (Denison and Harter 1995). Its function is to help transport oxygen to the respiring symbiotic bacterial cells in a manner analogous to hemoglobin transporting oxygen to respiring tissues in animals (Ludwig and de Vries 1986).
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Legumes and actinorhizal plants regulate gas permeability in their nodules, maintaining a level of oxygen within the nodule that can support respiration but is sufficiently low to avoid inactivation of the nitrogenase (Kuzma et al. 1993). Gas permeability increases in the light and decreases under drought or upon exposure to nitrate. The mechanism for regulating gas permeability is not yet known.Nodules contain an oxygen-binding heme protein called leghemoglobin. Leghemoglobin is present in the cytoplasm of infected nodule cells at high concentrations (700 Min soybean nodules) and gives the nodules a pink color. The host plant produces the globin portion of leghemoglobin in response to infection by the bacteria (Marschner 1995); the bacterial symbiont produces the heme portion. Leghemoglobin has a high affinity for oxygen (aK of about 0.01 µM), about ten times higher than the ß chain of human hemoglobin.Although leghemoglobin was once thought to provide a buffer for nodule oxygen, recent studies indicate that it stores only enough oxygen to support nodule respiration for a few seconds (Denison and Harter 1995). Its function is to help transport oxygen to the respiring symbiotic bacterial cells in a manner analogous to hemoglobin transporting oxygen to respiring tissues in animals (Ludwig and de Vries 1986).
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Kacang-kacangan dan tanaman actinorhizal mengatur permeabilitas gas di nodul mereka, mempertahankan tingkat oksigen dalam nodul yang dapat mendukung respirasi tetapi cukup rendah untuk menghindari inaktivasi nitrogenase (Kuzma et al. 1993). Kenaikan permeabilitas gas di dalam terang dan penurunan di bawah kekeringan atau setelah terpapar nitrat. Mekanisme untuk mengatur permeabilitas gas belum diketahui.

Nodul mengandung protein heme oksigen mengikat disebut leghemoglobin. Leghemoglobin hadir dalam sitoplasma sel nodul yang terinfeksi pada konsentrasi tinggi (700 Min nodul kedelai) dan memberikan nodul warna pink. Tanaman inang memproduksi bagian globin dari leghemoglobin dalam menanggapi infeksi oleh bakteri (Marschner 1995); yang simbion bakteri menghasilkan bagian heme. Leghemoglobin memiliki afinitas tinggi untuk oksigen (aK sekitar 0,01 M), sekitar sepuluh kali lebih tinggi dari rantai ß hemoglobin manusia.

Meskipun leghemoglobin pernah berpikir untuk memberikan penyangga untuk nodul oksigen, studi terbaru menunjukkan bahwa ia menyimpan cukup hanya oksigen untuk mendukung nodul respirasi selama beberapa detik (Denison dan Harter 1995). Fungsinya adalah untuk membantu transportasi oksigen ke sel-sel bakteri simbiosis respiring dengan cara analog dengan hemoglobin mengangkut oksigen ke jaringan respiring pada hewan (Ludwig dan de Vries 1986).
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