A very weak absorption maximum of phenylalanine occurs at 257 nm, tyrosine and tryptophan dominate the typical protein spectrum with their absorption maxima at 274nm and 280 nm, respectively.

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#Id: 9741

#Unit 6. System Physiology – Plant

Cyanide inhibits cytochrome c oxidase in the mitochondria, which blocks the electron transport chain.

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#Id: 9742

#Unit 6. System Physiology – Plant

Amygdalin (the common cyanogenic glycoside found in the seeds of almonds, apricots, cherries, and peaches). 

Dhurrin from sorghum 

Linamarin and lotaustralin from cassava.

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#Id: 9743

#Unit 6. System Physiology – Plant

Glycosylated triterpenoid compound avenacin A1, found in oat (Avena sativa) roots The wheat root pathogen Gaeumannomyces graminis var. tritici is extremely sensitive to avenacins

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#Id: 9744

#Unit 6. System Physiology – Plant

Tomato plants produce tomatine, a compound that is closely related to avenacin. Only certain pathovars of the fungal pathogen Septoria lycopersici can cause disease on tomatoes, and these pathovars produce a glucosidase that can detoxify tomatine.

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#Id: 9745

#Unit 6. System Physiology – Plant

According to Optimal Defense Hypothesis, 

Young tissues not only contain the highest levels of constitutive secondary compounds, they are also more responsive to herbivory. Thus, younger leaves exhibit more robust inducible defenses to herbivores than older leaves.

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#Id: 9746

#Unit 6. System Physiology – Plant

Constitutive defenses are costly to the plant. The production of secondary metabolites requires a significant energy investment derived from primary metabolism, which is then unavailable for use in growth and reproduction.