Druse (botany)

A druse is a group of crystals of calcium oxalate,^[1] silicates, or carbonates present in plants, and are thought to be a defense against herbivory due to their toxicity. Calcium oxalate (Ca(COO)₂, CaOx) crystals are found in algae, angiosperms and gymnosperms in a total of more than 215 families. These plants accumulate oxalate in the range of 3–80% (w/w) of their dry weight^[2]^[3] through a biomineralization process in a variety of shapes.^[4] Araceae have numerous druses, multi-crystal druses and needle-shaped raphide crystals of CaOx present in the tissue.^[5] Druses are also found in leaves and bud scales of Prunus, Rosa,^[6] Allium, Vitis, Morus and Phaseolus.^[7]^[8]

^ Franceschi VR, Nakata PA (2005). "Calcium oxalate in plants: formation and function". Annu Rev Plant Biol. 56: 41–71. doi:10.1146/annurev.arplant.56.032604.144106. PMID 15862089.
^ Zindler-Frank E. (1976). "Oxalate biosynthesis in relation to photosynthetic pathways and plant productivity: a survey". Z. Pflanzenphysiol. 80 (1): 1–13. doi:10.1016/S0044-328X(76)80044-X.
^ Libert B, Franceschi VR (1987). "Oxalate in crop plants". J Agric Food Chem. 35 (6): 926–938. doi:10.1021/jf00078a019.
^ McNair JB (1932). "The interrelation between substances in plants: essential oils and resins, cyanogen and oxalate". Am J Bot. 19 (3): 255–271. doi:10.2307/2436337. JSTOR 2436337.
^ Prychid CJ, Jabaily RS, Rudall PJ (2008). "Cellular ultrastructure and crystal development in Amorphophallus (Araceae)". Ann. Bot. 101 (7): 983–995. doi:10.1093/aob/mcn022. PMC 2710233. PMID 18285357.
^ Lersten NR, Horner HT (2006). "Crystal macropattern development in Prunus serotina (Rosaceae, Prunoideae) leaves". Ann. Bot. 97 (5): 723–729. doi:10.1093/aob/mcl036. PMC 2803424. PMID 16513655.
^ Jáuregui-Zúñiga D, Reyes-Grajeda JP, Sepúlveda-Sánchez JD, Whitaker JR, Moreno A (2003). "Crystallochemical characterization of calcium oxalate crystals isolated from seed coats of Phaseolus vulgaris and leaves of Vitis vinifera". J Plant Physiol. 160 (3): 239–245. doi:10.1078/0176-1617-00947. PMID 12749080.
^ Katayama H, Fujibayashi Y, Nagaoka S, Sugimura Y (2007). "Cell wall sheath surrounding calcium oxalate crystals in mulberry idioblasts". Protoplasma. 231 (3–4): 245–248. doi:10.1007/s00709-007-0263-x. PMID 17922267. S2CID 29944485.

[1] Franceschi VR, Nakata PA (2005). "Calcium oxalate in plants: formation and function". Annu Rev Plant Biol. 56: 41–71. doi:10.1146/annurev.arplant.56.032604.144106. PMID 15862089.

[2] Zindler-Frank E. (1976). "Oxalate biosynthesis in relation to photosynthetic pathways and plant productivity: a survey". Z. Pflanzenphysiol. 80 (1): 1–13. doi:10.1016/S0044-328X(76)80044-X.

[3] Libert B, Franceschi VR (1987). "Oxalate in crop plants". J Agric Food Chem. 35 (6): 926–938. doi:10.1021/jf00078a019.

[4] McNair JB (1932). "The interrelation between substances in plants: essential oils and resins, cyanogen and oxalate". Am J Bot. 19 (3): 255–271. doi:10.2307/2436337. JSTOR 2436337.

[5] Prychid CJ, Jabaily RS, Rudall PJ (2008). "Cellular ultrastructure and crystal development in Amorphophallus (Araceae)". Ann. Bot. 101 (7): 983–995. doi:10.1093/aob/mcn022. PMC 2710233. PMID 18285357.

[6] Lersten NR, Horner HT (2006). "Crystal macropattern development in Prunus serotina (Rosaceae, Prunoideae) leaves". Ann. Bot. 97 (5): 723–729. doi:10.1093/aob/mcl036. PMC 2803424. PMID 16513655.

[7] Jáuregui-Zúñiga D, Reyes-Grajeda JP, Sepúlveda-Sánchez JD, Whitaker JR, Moreno A (2003). "Crystallochemical characterization of calcium oxalate crystals isolated from seed coats of Phaseolus vulgaris and leaves of Vitis vinifera". J Plant Physiol. 160 (3): 239–245. doi:10.1078/0176-1617-00947. PMID 12749080.

[8] Katayama H, Fujibayashi Y, Nagaoka S, Sugimura Y (2007). "Cell wall sheath surrounding calcium oxalate crystals in mulberry idioblasts". Protoplasma. 231 (3–4): 245–248. doi:10.1007/s00709-007-0263-x. PMID 17922267. S2CID 29944485.

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