Consiglio Nazionale delle Ricerche, Istituto per il Sistema Produzione Animale in Ambiente Mediterraneo, Sassari, Italy.
Consiglio Nazionale delle Ricerche, Istituto Scienze delle Produzioni Alimentari, Sassari, Italy.
J Sci Food Agric. 2019 Jan 15;99(1):191-198. doi: 10.1002/jsfa.9160. Epub 2018 Jul 16.
In Mediterranean grazed woodlands, microclimate changes induced by trees influence the growth and development of the understory, although very little is known about its polyphenolic composition in relation to light intensity. We investigated the bioactive compounds and antioxidant capacity of different legume-based swards and variations as a result of full sunlight and partial shade. The research was carried out in a cork oak agrosilvopastoral system in Sardinia.
The highest values of (1,1-diphenyl-2-picrylhydrazyl) (DPPH) reached 7 mmol Trolox equivalent antioxidant capacity 100 g dry weight (DW), total phenolics 67.1 g gallic acid equivalent kg DW and total flavonoids 7.5 g catechin equivalent kg DW. Compared to full sunlight, partial shade reduced DPPH values by 29% and 42%, and the total phenolic content by 23% and 53% in 100% legume mixture and semi-natural pasture, respectively. Twelve phenolic compounds were detected: chlorogenic acid in 80% legume mixture (partial shade) and verbascoside in pure sward of bladder clover (full sunlight) were the most abundant.
Light intensity significantly affected antioxidant capacity, composition and levels of phenolic compounds. The results of the present study provide new insights into the effects of light intensity on plant secondary metabolites from legume-based swards, highlighting the important functions provided by agroforestry systems. © 2018 Society of Chemical Industry.
在地中海放牧的林地中，树木引起的小气候变化会影响林下植物的生长和发育，但人们对其多酚组成与光照强度的关系知之甚少。我们研究了不同豆科植物草地的生物活性化合物和抗氧化能力，以及全光照和部分遮荫条件下的变化。该研究在撒丁岛的一个栓皮栎农林复合系统中进行。
（1,1-二苯基-2-苦基肼基）（DPPH）的最高值达到 7mmol Trolox 当量抗氧化能力 100g 干重（DW）、总酚 67.1ggallic 酸当量 kg DW 和总类黄酮 7.5g 儿茶素当量 kg DW。与全光照相比，部分遮荫使 100%豆科混播草地和半天然草地的 DPPH 值分别降低了 29%和 42%，总酚含量分别降低了 23%和 53%。检测到 12 种酚类化合物：80%豆科混播草地（部分遮荫）中的绿原酸和纯毛蕊花草地（全光照）中的毛蕊花糖苷含量最丰富。
光照强度显著影响抗氧化能力、组成和酚类化合物的含量。本研究结果为光照强度对豆科植物草地植物次生代谢物的影响提供了新的见解，突出了农林复合系统提供的重要功能。 © 2018 英国化学学会。
