Akar tunggang
Akar tunggang adalah akar yang besar, sentral, dan dominan dari mana akar lain bertunas secara lateral. Biasanya akar tunggang agak lurus dan sangat tebal, bentuknya meruncing, dan tumbuh langsung ke bawah.[1] Pada beberapa tanaman, seperti wortel, akar tunggang adalah organ penyimpanan yang berkembang sangat baik sehingga telah dibudidayakan sebagai sayuran.
Sistem akar tunggang kontras dengan sistem akar adventif atau berserat dari tanaman dengan banyak akar bercabang, tetapi banyak tanaman yang menumbuhkan akar pohon selama perkecambahan terus mengembangkan struktur akar bercabang, meskipun beberapa yang mengandalkan akar utama untuk penyimpanan dapat mempertahankan akar akar yang dominan. selama berabad-abad, misalnya Welwitschia.
Referensi
- ^ Botany Manual: Ohio State University Diarsipkan 2004-08-06 di Wayback Machine.
Pranala luar
- 2006-01-13, Sciencedaily: Deep-rooted Plants Have Much Greater Impact On Climate Than Experts Thought Citation: "...The tap roots transfer rainwater from the surface to reservoirs deep underground and redistribute water... increases photosynthesis and the evaporation of water... by 40 percent in the dry season... During the wet season, these plants can store as much as 10 percent of the annual precipitation as deep as 13 meters (43 feet) underground, to be tapped during the dry months... tree roots acting like pipes to allow water to shift around much faster than it could otherwise percolate through the soil."
- Fullerton Arboretum on taproots Diarsipkan 2008-03-08 di Wayback Machine.
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