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ge+test).++%0D%0AThe+fourth+study%3A+Attempts+to+improve+orchid+performance+and+to+develop+high%0D%0Aeconomic+value+of+new+hybrid+orchid+progenies+through+hibridization.++This+study%0D%0Aconsisted+of+three+consecutive+experiments%2C+i.e.%2C+(1)+interspecific+and+complex%0D%0Ahybridization+of+several+parents%3B+(2)+in+vitro+seed+germination+on+six+media%0D%0Aformulation+as+mention+above+(VW%2C+MS%2C+foliar+fertilizer+of+NPK+32%3A10%3A10+at+2+g%2Fl%0D%0Awith+or+without+2+g%2Fl+tryptone)%2C+and+(3)+in+vitro+growth+of+the+hybrid+seedlings+on%0D%0Athe+six+media+tested.+Observations+in+the+first+experiments+include+the+percentage%0D%0Aof+successful+pollinations+to+form+fruits%2C+mature+fruit+harvesting+age%2C+diameters%2C%0D%0Aweights%2C+and+length+of+the+fruits.++Data+were+analyzed+using+ANOVA%2C+followed+by%0D%0ADMRT.++Data+on+seed+germination+and+in+vitro+growth+of+hybrid+seedlings+were%0D%0Aalso+subjected+to+ANOVA%2C+and+if+there+was+any+significant+different+among%0D%0Atreatments%2C+the+mean+separation+procedures+were+done+using+Tukey%E2%80%99s+HSD+test.+%0D%0AResults+of+the+first+study+showed+that+(1)+The+dissimilarity+level+between+orchid%0D%0Aclusters+was+low%2C+i.e.%2C+8.5%25+in+the+genus+of+Dendrobium+and+10%25+in+the+Eria.%0D%0ATherefore+crossing+among+these+species+within+similar+genera+could+possibly+to%0D%0Aoccur.+(2)+In+general%2C+in+the+genus+of+Dendrobium%2C+phylogeny+analysis+showed%0D%0Athat+there+was+an+average+of+19%25+dissimilarity+level+among+species+and+up+to+17%25%0D%0Aof+dissimilarity+among+species+in+the+genus+of+Eria.+(3).+There+were+three+very%0D%0Asimilar+pairs+of+species+in+the+genus+Dendrobium+based+on+the+observational+characters%2C+namely+D.+annae+and+D.+mutabile%2C+D.+anosnum+and+D.+aphyllum%2C+and%0D%0AD.+leonis+and+D.+subulatum.+%0D%0AResults+of+the+second+study+showed+that+(1)+the+daily+pattern+of+temperature+and%0D%0Ahumidity+in+the+two+different+heights+(2+m+and+4+m)+of+D.+sissoo+stands+were+more%0D%0Astable+than+those+on+C.+nucifera+stands.+(2)+At+the+36+weeks+after+planting%2C%0D%0ARhynchostylis+retusa+plants+mounted+at+a+height+of+4+m+had+a+higher+percentage+of%0D%0Aflowering%2C+flower+length%2C+and+axis+length+than+those+grown+at+a+height+of+2+m.+(3)%0D%0ARhynchostylis+retusa+grown+at+different+heights+on+D.+sissoo+produced+the+highest%0D%0Anumber+of+attached+roots+and+number+of+total+roots+than+those+planted+on+other%0D%0Astands.+(4)+The+orchid+R.+retusa+mounted+on+D.+sissoo+produced+the+highest%0D%0Aprecentage+of+flowering+and+number+of+leaves+compared+to+those+mounted+on%0D%0Aother+stands.+%0D%0AResults+of+the+third+study+showed+that+(1)+there+was+no+incompatibility+barriers%0D%0Ato+all+Dendrobium+orchids%2C+both+in+selfing+and+in+the+crossing+of+several+parent%0D%0Aplants+tested%2C+(2)+Orchid+seeds+produced+from+self+pollinations+could+germinate%0D%0Aand+grow+well+in+all+media+tested%2C+especially+on+MS+or+foliar+fertilizer+with%0D%0Aaddition+of+tryptone%3B+(3)+Foliar+fertilizer+of+NPK+32%3A10%3A10+at+2+g%2Fl+with+addition+of%0D%0A2+g%2Fl+tryptone+appeared+to+be+the+best+media+to+support+in+vitro+growth+and%0D%0Adevelopment+of+Dendrobium+mirbelianum%2C+Dendrobium+nindii%2C+Dendrobium%0D%0Adiscolor+Merauke%2C+and+Dendrobium+discolor+Tanimbar+seedlings.+%0D%0AResults+of+the+fourth+study+showed+that+%3A(1)+D.+mirbelianum+(P1)+could+be%0D%0Areciprocally+crossed+to+D.+nindii+(P2)+and+D.+discolor+var.+Merauke+(P3)%2C+and+all%0D%0Acrosses+produced+fruit+pods.+However%2C+(2)+Crossing+of+D+nindii+x+D.+mirbelianum%0D%0Aresulted+in+relatively+larger+fruits+compared+to+the+other+crosses%2C+and+(3)+crosses+of%0D%0AD.+nindii+as+a+female+parent+resulted+in+better+seedling+growth+than+that+as+a+male%0D%0Aparent.+Moreover%2C+the+addition+of+tryptone+to+all+basal+media+tested+significantly%0D%0Aincreased+seedling+growth.+In+general%2C+2+g%2Fl+of+foliar+fertilizer+NPK+32%3A10%3A10+with%0D%0Aaddition+of+2+g%2Fl+tryptone+was+the+best+medium+for+the+growth+of+orchid+seedlings%2C%0D%0Aas+shown+by+both+clump+heights+and+fresh+weights.+The+results+of+the+second%0D%0Aexperiment+(4b)+showed+that+(1)+there+was+no+incompatibility+barriers+in+all+of+the%0D%0Acomplex+hybrid+crosses+among+Dendrobium+parent+plants+(2)+The+results+of+this%0D%0Astudy+recommend+the+use+of+foliar+fertilizer+NPK+32%3A10%3A10+at+2+g%2Fl+as+media+for%0D%0Aorchid+seed+germination%2C+since+it+was+the+simplest+and+most+efficient+medium%0D%0Acompared+to+the+other+formula%2C+and+(3)+The+foliar+fertilizer+medium+with+addition%0D%0Aof+2+g%2Fl+tryptone+resulted+in+the+best+in+vitro+growth+of+Dendrobium+hybrid%0D%0Aseedlings.+%0D%0AKey+Words%3A+characterization%2C+ex+situ%2C+hybridization%2C+in+vitro%2C+orchid%2C%0D%0Areintroduction.++&rft.publisher=FAKULTAS+PERTANIAN&rft.date=2023-05-23&rft.type=Disertasi&rft.type=NonPeerReviewed&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F72813%2F1%2FABSTRAK.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F72813%2F2%2FDISERTASI%2520FULL.pdf&rft.format=t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