Brassicaceae Mustards: Traditional and Agronomic Uses in Australia and New Zealand
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molecules Review Brassicaceae Mustards: Traditional and Agronomic Uses in Australia and New Zealand Mahmudur Rahman ID , Amina Khatun ID , Lei Liu ID and Bronwyn J. Barkla * ID Southern Cross Plant Science, Southern Cross University, Lismore, NSW-2480, Australia; [email protected] (M.R.); [email protected] (A.K.); [email protected] (L.L.) * Correspondence: [email protected]; Tel.: +61-2-6620-3159 Received: 20 November 2017; Accepted: 18 January 2018; Published: 21 January 2018 Abstract: Commonly cultivated Brassicaceae mustards, namely garlic mustard (Alliaria petiolata), white mustard (Brassica alba), Ethiopian mustard (B. carinata), Asian mustard (B. juncea), oilseed rape (B. napus), black mustard (B. nigra), rapeseed (B. rapa), white ball mustard (Calepina irregularis), ball mustard (Neslia paniculata), treacle mustard (Erysimum repandum), hedge mustard (Sisymbrium officinale), Asian hedge mustard (S. orientale), smooth mustard (S. erysimoides) and canola are the major economically important oilseed crops in many countries. Mustards were naturalized to Australia and New Zealand and Australia is currently the second largest exporter of Brassicaceae oilseeds to meet the global demand for a healthy plant-derived oil, high in polyunsaturated fats. Apart from providing edible oil, various parts of these plants and many of their phytochemicals have been used traditionally for both agronomic as well as medicinal purposes, with evidence of their use by early Australian and New Zealand settlers and also the indigenous population. This review provides an overview of the current knowledge of traditional and agronomic uses of Brassicaceae oilseeds and mustards with a focus on their importance in Australia and New Zealand. Keywords: Brassicaceae oilseeds; bioactive constituents; canola; mustard; glucosinolates; agronomic importance; Australia and New Zealand traditional medicine 1. Introduction Brassicaceae comprise a diverse family of plants and provide one of the most extensive and varied range of end products used by man from a single plant genus. Mustards are members of the Brassicaceae family, and are among the earliest cultivated plants. Their seeds are one of the oldest recorded spices with use and cultivation dating back over 5000 years [1–3]. Literature suggests that, within the history of human settlement in Australia and New Zealand, different types of Brassicaceae mustards, namely Alliaria petiolata, Brassica alba, B. carinata, B. juncea, B. napus, B. nigra, B. rapa, Calepina irregularis, Erysimum repandum, Neslia paniculata, Sisymbrium officinale, S. orientale and S. erysimoides have been naturalized (Figure1), and adapted for use as food, incorporated into traditional medicine and play an important role in the agriculture of the two countries [4–15]. Molecules 2018, 23, 231; doi:10.3390/molecules23010231 www.mdpi.com/journal/molecules Molecules 2018, 23, 231 2 of 18 Molecules 2018, 23, 231 2 of 18 Figure 1. DistributionDistribution of ofmustards mustards in inAustralia Australia and and New New Zealand. Zealand. A. pe A.= Alliaria pe = Alliaria petiolata petiolata, B. al =, B.Brassica al = albaBrassica, B. ju alba= B., junceaB. ju, B.= naB. = junceaB. napus, B., B. na ni = B.B. nigra napus, B., raB. = niB. rapa= B., C. nigra ir = ,CalepinaB. ra =irregularisB. rapa, C.E. irre= =Calepina Erysimum irregularis repandum, E., reN.= paErysimum = Neslia repandumpaniculata,,N. S. paof == NesliaSisymbrium paniculata officinale, S. of, =S.Sisymbrium or = S. orientale officinale and, S.S. er or == S.S. erysimoides orientale and. BoxS. represents er = S. erysimoides in which .state Box or represents region the in species which are state distributed. or region The the figure species is areadapted distributed. from [16–19], The figure Atlas isof adapted Living Australia, from [16– 19Australia’s], Atlas of Virtual Living Herbarium, Australia, Australia’sFlora of Australia Virtual Herbarium,Online, Flora Floraof New of Zealand, Australia Plants Online, for the Flora Future of NewDatabase, Zealand, National Plants Library for theof New Future Zealand, Database, New NationalZealand LibraryPlant Conservation of New Zealand, Network, New ZealandAuckland Plant Museum Conservation (http://www.aucklandmuseum.com/ Network, Auckland Museum (collection/object/)http://www.aucklandmuseum.com/collection/object/ and http://www.herbiguide.com.au. ) and http://www.herbiguide.com.au. Mustards havehave been been consumed consumed for centuriesfor centuries as vegetables, as vegetables, and their and products their usedproducts as condiments used as andcondiments as edible and and as industrial edible and oils industrial [2,20]. The oils oil [2,2 is commonly0]. The oil used is commonly for cooking used and for to cooking add a hot and and to spicy add flavora hot and to food spicy [7 ].flavor As a crop,to food they [7]. are As also a crop, one ofthey the are highest also one oil yielding of the highest and high oil proteinyielding containing and high oilseedprotein species.containing Economically oilseed species. important Economically members ofimportant this family members include vegetablesof this family like broccoli,include cabbage,vegetables Chinese like broccoli, cabbage, cabbage, turnip, andChinese cauliflower, cabbage, and turnip, the seed and oil cauliflower, crop canola and [18 ,21the]. seed Canola oil iscrop the secondcanola [18,21]. most economically Canola is the important second most edible econom oilseedically crop worldwide,important edible with annualoilseed world crop worldwide, production inwith excess annual of 73 world million production tons. It is in the excess third-most of 73 importantmillion tons. crop It tois Australianthe third-most agriculture important after crop wheat to andAustralian barley, agriculture and second after most wheat cultivated and barley, oilseed and after second soybean, most cultivated with an annual oilseed production after soybean, of about with 3.5an millionannual tonsproduction [2,22]. Accordingof about 3.5 to themillion crop reportstons [2,22]. of Australian According Oilseeds to the Federationcrop reports and of first Australian quarter reportOilseeds of AgriculturalFederation and commodities first quarte byr report Australian of Agricultural Bureau of Agriculturalcommodities andby Australian Resource Economics Bureau of andAgricultural Sciences and in 2017, Resource less than Economics 20% of theand rapeseed Sciences (largelyin 2017, canola)less than oil 20% produced of the inrapeseed Australia (largely stays incanola) the country. oil produced Over 80% in Australia of this commodity stays in the is exportedcountry. Over to Europe 80% of of this which commodity almost all is is exported directed toto bio-fuelEurope of production which almost [23]. Australiaall is directed supplies to bio-fuel about 20% production of the global [23]. demandAustralia for supplies edible canolaabout oil20% [24 of]. Thethe global edible demand oil contains for lowedible pungency, canola oil low [24]. erucic The acidedible (less oil than contains 2%) andlow lowpungency, aliphatic low glucosinolate erucic acid (less(less thanthan 30 2%)µmol/g). and low These aliphatic low levels glucosinolate have been (le obtainedss than from 30 µmol/g). designed These breeding low of levels several have cultivars been ofobtainedB. juncea from, B. designed napus, B. rapabreedingand S.of albaseveral[25, 26cultivars]. Australian of B. juncea canola, B. gradenapus, oilseed B. rapa cropsand S. consistently alba [25,26]. showAustralian on average canola a 2%grade higher oilseed oil yieldcrops than consistently worldwide show averages on average (41.8% compareda 2% higher to 40% oil oilyield per than dry seedworldwide weight) averages [27] and (41.8% yields morecompared oil per to unit 40% of oil land per area dry comparedseed weight) to any [27] other and oilseedyields more crop [oil21 ,28per]. Canolaunit of oilland is onearea of compared the most popularto any other edible oilseed and healthy crop [21,28]. cooking Canola oils due oil to is its one low of saturated the most fatty popular acid content,edible and high healthy mono-unsaturated cooking oils fattydue to acids, its low and saturated balanced contentfatty acid of omega-3content, high fatty mono-unsaturated acids. Canola oil is alsofatty used acids, to and manufacture balanced condiments, content of omega-3 as a preservative, fatty acids. and Canola as taste oil and is flavoralso used enhancers to manufacture in pickles, chutneycondiments, and otheras a processedpreservative, foods and [29 as]. Australiataste and exports flavor theenhancers surplus seedin pickles, meal after chutney oil extraction and other as aprocessed source of foods animal [29]. protein Australia [30]. exports Canada the is the surplus largest seed producer meal after and oil exporter extraction of canola as a source grade of rapeseed animal protein [30]. Canada is the largest producer and exporter of canola grade rapeseed which mainly Molecules 2018, 23, 231 3 of 18 which mainly grows genetically modified canola (GM) whereas the canola grade rapeseed grown in Australia is non-GM [23]. Like Australia, oilseed rape is the most important oilseed crop in New Zealand where it is the most popular food grade cooking oil and used to manufacture spreads, dressings and for biofuel production. The oil content is similar to the global average at about 40%. According to the United States Department of Agriculture statistics, about 55,000 metric tons of rapeseed oil was consumed in New Zealand