web search and cut and past for relationship between guttation drops and bacterial diseases
Guttation is the process of liquid exudation from hydathodes situated on the tip, along the margins and adaxial and abaxial surfaces of leaves. Hydathodes, also known as water stomata or water pores, unlike stomata, are always open representing the path of least resistance to the liquid outflow from them. Guttation fluids contain a variety of living and non-living ingredients. The living materials include algae, fungi, bacteria, viroids and viruses. The non-living organic constituents include toxins, mycotoxins, alkaloids, proteins, enzymes, sugars, amino acids, volatiles, hormones, vitamins, etc., and the inorganic components include Na, K, Ca, Mg, Mn, B, Co, Zn, Se, Ni, Fl, Si, As, Al, Cl, NH 4 , NO 3 , PO 4 , SO 4 , CO 3 , HCO 3 , etc1
Recent information suggests that guttation fluid contains small anti-pathogenic peptides (APPs) that serve to restrict or inhibit microbial proliferation 1. However, guttation fluid can also be a gateway for diseases on plants as bacteria can enter a plant through guttation 2. A study revealed that in greenhouse-grown tomatoes guttation helped spread bacterial canker responsible for tomato wilt. When plants were handled while guttation was present they fell sick and the disease spread 2.
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